That is not the only reason to marry, but it is an enjoyable and important part of most marriages.
I am sorry your parents’ marriage did not provide a positive example of married life for you. I committed to my wife a long time ago, have been married 23 years, and it (and she) has been a huge blessing in my life. I am more and more joyful about my relationship daily, and love my wife dearly (even during our times of hardship, of which we have had our fair share). The responsibility of both marriage and parenthood are the hardest things I have ever taken on, but are also the things that have filled me with the most joy over the years. There is a cost to marriage, but the benefits (for me) have far exceeded that cost...in comfort, companionship, the absence of loneliness...
I have never considered myself handsome, and have had the same temptations as anyone else. Marriage provided a blessed outlet for my sexual desires. I didn’t have many girlfriends, but I found the only one that mattered I needed the end - my wife.
They probably don’t advice because many of them (like myself) didn’t overcome it themselves when younger. I have no advice, but I will pray for you. Some married people only complain about their lives. Marriage is a blessing, but it takes hard work, self-sacrifice, and love (see 1 Corinthians 13) to make it work. It is not easy, but it can be worth it.
It sounds like your issues are as much about avoiding sinful sexual thoughts and actions, while recognizing that marriage is a big commitment, which you may not be ready for. Pray, focus on God, and I will pray for you. I have no other advice, as I wasn’t “pure” in any sense in my youth. I thank God that He is forgiving and can overcome any sin. I didn’t see that my sexual sin hurt anyone in my youth; it has only been with age that I realize deep within that I grieved the Lord and, in essence, cheated on my wife with every sexual encounter I had (even before I met her).
May God be with you.