There could be billions of reasons why you don’t have a boyfriend, and I’m sure you know that. You also know no one can answer this question because no one knows you. That makes this a rhetorical question. In other words, a plaintive cry. “Oh, woe is me. I have no boyfriend.”
Well, I could be sympathetic, but once again, that would be meaningless because we don’t know each other. I could also make fun of you, but that would be meaningless because they don’t tolerate that kind of meanness around here and my comment would get moderated (read, deleted). I don’t want to make fun of you, anyway.
l think it can be very hard to be single when all your friends are in couples. It often happens that you get left out of things, which is bad enough, but then you get included in things, and that can be worse.
Several people here have suggested you not complain, but instead look at the advantages of being single. If you want to know what those are, ask another question. I think that’s a helpful way of looking at it. Appreciate what you have instead of whining about what you don’t have.
The other thing is if you are serious, develop a plan that is customized for you (we can’t give it to you), that will move you towards your goal. The first thing to do is figure out your goal—do you just want a guy, or do you want something serious? Etc., etc. Then you figure out the steps you can take to achieve your goal.
Now crying plaintively can be a part of your plan. It might annoy some people who will tell you to stop complaining and get on with it. Others might offer a sympathetic shoulder. Others might even tell you something practical that will help (I wouldn’t count on that—I have found that most of the social advice around here is opinion and not practical).
But, after you have unburdened yourself of your angst, if you are serious about it, you have to take steps, whatever those may be (you’re the only one who can know). If all you want to do is drop little buckets of angst here and there, you can do that, but I don’t think people will have much patience for you.
So I suggest you get started with your plan, and stop feeling sorry for yourself. Be grateful you are alive and have this problem.