guilt/ soreness

ok so sex is great but for a long time I had a lot of anxiety about it and it just stopped being good. but now it's better and I love it but after wards I feel really guilty and weird. also after I feel kinda like stretched out and it kind of hurts any advice? I'm 17 and I'm with a guy I've been with for 1.( years and he's great so I don't think he is the problem with the guilt. pls help!!