Why do I feel like this all the time?

Hello, I am a 17, soon to be 18, y.o. male. It is kind of complicated but try to keep up with me. A lot of my friends have girlfriends or they have done the thing and I kind of feel left out. I have that kind of feeling where on one hand I want a nice girlfriend who is going to love me and be by my side for who I am. I want to lose my virginity with that girl and not some random girl or hooker who doesn't like me whatsoever. I want it to be a special moment for the both of us and not just something pleasurable for me and another day at work for her. At the same time, though, I think that I don't want any relationship and I just want to experience how pussy feels like. I think I am kind of ugly to get a good girlfriend, because I am overweight but my parents and friends tell me that it doesn't work like that. They tell me that I am able to get a girlfriend and I just don't try. I don't know what it is. Maybe I just haven't tried hard enough to attract any females. This is something I generally feel. Now that I will become an adult in 16 days and live by myself in 2 months or so, I think about this a lot more. I feel like waiting, getting in a better shape, and in general bettering myself, but at the same time I just can't wait (sorry, I am horny 24/7, testosterone is pumping in my blood haha). Anyway what do you think? Maybe some girl will she this and help me (lol)... I am down bad sorry. Some say men rule the world, but the truth is that pussy rules the world.

TLDR: I am horny, I can't decide between waiting to have sex or doing it when I become an adult