Yes, I realize I am coming in a bit late, but I would like to sort of echo some of the stuff I am thinking from your post.
I really need a girlfriend... I feel like my life is sort of empty I checked out some dream interpretation online before I found out she was 11 and all just because I'm really into the study of dreams and sleep and I saw a barren market in my dream and the interpretation for that is that something is missing... A void in your life... And I think that might be a girl...
First of all, if you are getting a girlfriend simply because you "need a girlfriend", then that relationship WILL NOT last. As for that void, like others have said, that is not going to able to be filled with a girlfriend. That is a void that can only be filled with Jesus. A relationship with him is more important than any other relationship you could ever have on this Earth.
Secondly, I personally do not date. I see all the peer pressure to go date, but it is seriously not a big priority for me. I am about to graduate from high school. I have not had a single girlfriend, ever, and I do not regret that. There is SO MUCH drama.
Also, when you are just friends, there is not a big status that there is when you start dating. When you start going out, you get this big title of "boyfriend and girlfriend" that is only there to be torn down.
Another thing, I personally think that 13 is a bit young for dating. Dating is supposed to be you spending time with the person that is potentially going to be your spouse. You still have 4 or 5 years of school left, so lots can change. If you get into that relationship and do even the slightest thing wrong, if you even give her an excuse to break up with you, it will most likely happen. That's how the dating scene is currently, unfortunately.
So if you stay just friends until you're both older and more mature, the relationship will have MUCH more potential of working out better.
Lastly, you can still spend time with her as friends. You don't have to be going out with someone to get to know them. Two of my best friends were girls. People thought in both cases that I was dating that person, but we are just really good friends.