Does anyone else overthink their sex?

I don’t know why, I have always been shy when it comes to opening up sexually with my partner, not that I can’t be sexual but that talking or literally opening up (I’m sorry) down there is difficult. I can get off but most of the time, in the beginning, I am completely in my head and preventing myself from enjoying everything until I start pleasuring my partner. 😫 I don’t know what’s wrong with me! I just want to enjoy myself but over think everything to the point that things become uncomfortable until I get over it. Does anybody else do this and are there any tricks to just relaxing your mind?