Cumming??

So I've never cum. 21 years old and I just haven't figured it out. No guy has ever made me cum, not that they tried very long or hard. But I've also never been able to make myself cum. I just now started trying to masterbate like a month ago but I'm like not good at it or something, idk. Its like I lose whatever good feeling I have within less than a minute and I can't make myself cum. Any tips on how to up my game with myself? Lol

PS no hate to the guys who couldn't make me cum. I understand it's hard for them when I can't tell them any feedback cause I don't even know how to myself lol