Is it weird to get offended if your SO is masturbating?

Zoe
Ive been in a relationship for almost a year now, my first serious relationship. I used to be very self conscious about foreplay and that sort of thing. I thought I was useless at wanks and blowjobs and all that and would try to avoid it as much as possible. I confessed this to my boyfriend and he gave me tips and let me know if I was doing it wrong which increased my confidence a good bit! I want to be able to pleasure him and blow him away, which is why I get kind of upset if he says he had a wank. I wonder if I'm not pleasuring him enough. I mean as his girlfriend I should be pleasing him enough, and he shouldn't need to wank. Is this just silly thinking? I know it's natural for men to masturbate, but I can't help feeling that way.