What should I do ?

So I'm 17 and I haven't had sex since I lost my virginity almost 2 years ago since then my stress has been threw the roof. I know I want to have sex but here's the problem... when I lost my virginity it really wasn't done by my own free will and since then every time I come close to having sex agian I back out I'm tired of hiding. There's this new guy I'm talking to and I know he's frustrated with me should I tell him what happened to me or just force my self to have sex ? Help me.