Blowjobs

My boyfriend and I have done hand stuff and had sex, I'm not sure if he wants a blowjob and if he did I would do it I'm more scared how he's going to react and that he won't want to kiss me after.  He's also very self conscious so I'm not sure he wants me down there face face with it 😂 anyone else with this problem?  Any tips or ways I can find out how he feels about this without directly asking?