Too much sex?

I met this guy that I really like and now my body count makes me feel ashamed that I just have sex right and left without caring about a connection. Also I’m afraid of getting an STD but for some reason I just keep getting into sexual situations with people and going along with it (I use protection but still) and I want to slow down but it’s like weird I feel like I don’t have the power to say no. What do I do?