I'm 15

So I'm a sophomore in highschool and I wanna have sex so bad. Not with guys my age tho guys that are like 19-23. I don't like boys my age because they fuck you then they leave you. Guys around my specific age stay for at least a year. Only thing is that I don't like they have someone their age and my age. I wanna be the only one. A lot of my friends seem innocent but their not and we all somewhat do the same thing. What should I do. I know about the downside of having sex so that's why I don't. But I want it so badly.