No longer a virgin ...help

So my boyfriend and I had sex about 2 months into our relationship, I grew up pretty religious and never had sex Ed or anything. He has had sex with a couple people. My question is It normal that I feel weird about the fact he has been with other people and I haven't? I always wonder if I'm doing something weird or if other girls were sexier than me, he seems to really love me and we are going on 5 months now but I'm just insecure about sex in general, how do I even know if it's good sex haha I don't have anything to compare it to!