Ivan,
It's funny. As I read your message, I was scanning an article in the library about Singapore. It had nothing to do with dating. How is dating handled in Singapore? Do teens date in high school, or does dating start after high school ends?
Something to keep in mind is that dating cultural practices are less than 100 years old. From what I've read the modern concept of the 'girlfriend' is less than 100 years old, too. Before the automobile and philosophies about dating promoted by women's magazines, men used to court young women. They might talk to the girl on her parent's porch. Then, one of the suitors might propose marriage. The family would discuss it, and if they approved, the young woman might agree to it.
But nowadays, young people date. Society encourages it. Parents encourage it. Girls get emotional needs satisfied-- that should be satisfied by a husband in marriage-- by a boyfriend. Boys get these emotional needs satisfied by girlfriends. They have numerous emotional affairs, dating and breaking up, and carry the emotional baggage into marriage. Even worse, the way dating is done here in the US, a lot of young people go off somewhere alone and end up committing sexual sin.
Recreational dating is a bad thing. If you are going to date, wait until you are close to being able to practically get married, and then only date someone you might potentially marriage. If you know her values are not in line with yours and you know she isn't a potential marriage partner, don't continue the relationship. Dating should not be to satisfy emotional needs or to have some kind of social status. You should be looking for a wife.
Biologically, if you are 20, you are old enough to marry. But that doesn't mean you are ready to marry, practically. You need to be able to support a wife and children that are produced from your marriage. So if you want someone to love, focus really hard on preparing yourself to be in a position to marry. That may mean studying hard or learning a trade.
I like Singapore. It's a nice orderly developed refuge surrounded by the wild developing world. The economy is really developed, but people tend to be career-minded. I hear it's hard to find a wife in Singapore. Singaporean women tend to focus on their careers, and the government has been promoting marriages and having children. It's easy to get married in Singapore if you have $10k in Sing dollars because you can just go down to the Vietnam matchmaker and pick one of the girls to be your bride.

Seriously, don't do that.

I saw a video on that, and found it to be a curious way to marry. If you do get set up to get married and have difficulty finding someone in the right age range who is serious, lots of Indonesians will marry young. The whole country is really marriage-minded. Marrying a foreigner can be considered somewhat desirable depending on who you talk to. And if you want to marry a Chinese woman, there are plenty of Chinese people in the city. Indonesia would be a great place to go if you want a home and family oriented wife, though plenty of women do various types of business activities as well. If you were ready to support a family at a young age and couldn't find a willing Singaporean partner at the right age range, Indonesia is a short plane or boat ride from Singapore. There are also Chinese-Indonesian churches, but I don't know if they'd marry young or not.
My wife's Indonesia, so I'm a little biased on how great Indonesian wives are. She's about an 8th Chinese though, and wasn't raised in Indonesian Chinese culture at all.
The desire you have to find someone to love is a normal thing. It is good advice when people tell you to focus on the Lord. But I also believe the innate desire for a spouse is a God-giving thing. God saw that it was not good for the man to be alone. He had Adam look at the animals and name them. The lion had the lioness. The tiger had the tigress. The donkey and the she-donkey. He didn't have a match. None of the animals was a match for him. He must have had a desire for someone, and realized he was alone. Did God tell him to just pray more? No, he gave him a wife. Adam was already set up, though, with a way to 'earn a living.' He had a garden to tend to and eat and a whole planet to subdue. Then God brought him a wife.
While you are waiting, you can try to improve yourself to be a better future husband. Do get closer to God. Pray, read the word. Study and meditate and what you want your marriage and family to be like and prepare yourself. You can read books and articles on marriage.
I had had a desire to have someone to love from a young age. I didn't have a real girlfriend, though, until I was a little older than you. It was probably a good thing and helped keep me out of trouble. When I started dating, I didn't really find someone who seemed to be a suitable match for me. I remember thinking is it ever going to really happen to me? Will I ever get married? I prayed about it. When I got to be about 26, I was alone for Christmas overseas, and I realized I really wanted my own family. I didn't like being alone. I knew that already, but I got even more serious about praying about it. In a couple of months, I'd met the woman I would marry. She told me later she knew before we had that first conversation. I went home asking God if she was the one who would be my wife. We were 'just friends' for a while, talking on the phone, each one trying to subtly pry out of the other one if we thought the Lord was directing us toward marriage. We didn't really show our cards until later, though.
Use your single years well for the glory of God. When you are single, you have more free time to devout to prayer, ministry, study, and hard work. If you want someone, work hard and get ready for marriage, acknowledging the Lord in all your ways. Then you can tell the Lord you've worked hard and gotten ready to support a wife, and ask Him to help you find one.