Why cant i get a girlfriend?

i can't ever seem to get a girl to like me. im 17 years old. i think im pretty good looking, i dont have the best body, but im not fat or anything like that. im kind, generous, and in most cases confident. except for when it comes to talking to girls i like, but i've been getting better. i sometimes notice girls looking at me and when we make eye contact we would both quickly dismiss the connection, but then do the same thing 50 more times if we're in the same room. this happens with sometimes with me and maybe a girl i've never even talked to before. i used to think that was a sign that they thought i was attractive in a way, but i dont really believe that anymore because, i can never get anywhere when it comes to girls and relationships. i like to make people laugh and stuff and yea. idk. the main question i find myself asking in my mind (which you guys wont be able to answer lol) is am i actually a good looking guy, or do girls just see me as not that good looking and never take interest in me. theres just so much that i dont get and it all leads to questions like "what if when i was talking to that girl she got creeped out by me" or "maybe she just doesnt find me attractive" just a bunch of questions i ask because of my insecurities. and the main thing that im insecure about is my body. like i said im not fat or anything nor chubby, i wouldn't even consider myself over weight. i just have i guess a little "chub" around my mid section and thats what always bothers me and makes me wonder what if girls dont like me becuase of my weight. and i exercise and eat healthy and i have been sliming down. im just having trouble with slimming down more lol. sorry for making this so long. but i guess i just had a lot to let out there. so finally, am i being to paranoid (probably) and if i am what is it that im doing that i cant start any type of relationship with a girl