Confidence when giving blowjobs

I want to give my boyfriend a blowjob. I have never given someone one before. I also have never given anyone a handjob because I know that it won’t compare to what he can do to himself. I know that I can physically do it, I’m just putting up a mental block for some reason. I struggle with my self image, assertiveness, and confidence in general. I’m also a worrier and over thinker. I’ve got lots of issues lol. But that’s not the point now. In my head, all I can think about is how his pleasure is strictly based on what I’m going to be doing. I think that I will just overthink everything and not actually enjoy it. I am also semi-worried about the fact that he will tell his friends about it, especially if it’s bad. I know that all of this is kind of stupid, so I’m sorry.

I’m just wondering how I could gain some confidence when it comes to actually giving blowjobs and if you guys have any tips. Thank you!