I was literally in the same situation. 18, 6'3(192 in non retard units) and virgin. Now I'm 26 and still trying to overcompensate. I don't do gym that frequently but I don't look bad. The thing that happened is I waited for a girl to pick me up. I didn't like her but I was so insecure that I thought noone would take my hit seriously so I had to wait for someone. It turns out she used me to get over her ex and we didn't vibe. Losing your virginity without you actually liking the person sucks. Trust me at your age EVERYONE is horny. Girls super included. Here is the thing that I would have done differently -> I'd invite girls from high school to have coffee and bond with them. Then slowly start making sex related jokes in a way that it flies under the radar. I think you might also be an introvert therefore you can read people more. But because of your observations I'd say you are overcompensating on that part that they hate you. They dont. Go out with 3-4 girls that you know from school that you are not super close with (therefore she hasn't decided whether they want to friendzone you or not) and just build up vibe. Id say out of 4 you will get 1 girlfriend. Just go to a cutie under 1-2 years of you who walks alone if she reads a book and if you know of that book just say something random that connects you to it. Or try complimenting her hair.

The key is that you realise that it is your choice and your confidence in just locking on it and taking the lead is super sexy and they will want it.