I get anxious now talking to men

I (25f) used to have so much confidence going out and dating before my ex, it's been almost a year since becoming single and I'm trying to get out there and I'm now just getting anxiety talking to men. There's one guy I've been speaking to since October but it's long distance and that isn't gonna work with me. I feel no confidence in my body, I'm going gym now and trying to lose the weight I gained from my relationship but I see no difference no matter what the scales look like. I live in London which has plenty of ways to meet people but since I stopped drinking and stay in and play games I get anxious going out and talking to people. I miss the girl I was before my ex. I go to metal gigs sometimes and that's the only thing I enjoy doing outside but I went to a gig on Saturday and my anxiety got the better of me and I ended up leaving early. Sorry this is more of a rant about my stupid brain more than anything. Has anyone got advice on how to get my confidence back?