Can’t orgasm

I’ve been with my boyfriend for over a year now and we’ve started becoming sexually active this summer. I do get wet while we are in the middle of things but I have a problem releasing, especially during oral sex. I feel bad because I don’t want him to feel like he isn’t doing enough for me. I’ve tried to masturbate but the only thing that has really got me to that point was using a vibrator. I don’t know what to do and I’ve been trying to learn how to get that feeling without any use of toys and such but it’s hard. Any tips?