Haven't had sex since my ex

My ex was my first love, and the breakup ruined me, but I'm slowly recovering, it's been 6 months since I broke up with him, the relationship was mentally abusive and I had to get out, he had drug problems too. Ever since him, I haven't had sex with anyone else and it's really messing up my mind. If you've only had sex with one person, wouldn't you think about that specific experience only? I need more experience but I can tell I'm not making myself available because I'm scared to let anyone in again (mentally and physically lol). I just need advice on how to put myself out there after going through so much hurt. I've had a lot of crushes and 1 other small hookup (no sex) but they never go very far. Please help ):