tbh, im lonely

I'm 18. You know how people say they don't have friends but at least have people to text when they're bored. I have neither! I have no friends or associates. I have no relationship with anyone & im tired of it. Boys just want sex & tbh I use to just have sex with them just to get out or have company or even get a text. I have no female friends & I just don't know where or how to get any. I tried just adapting to being lonely by going out alone but it's not working. I hear people laughing & talking while I just sit there. What should I do? Is there like a app for meeting friends? This is making me very emotional