orgasms

this is gonna sound weird but like how do you know if you have an orgasm ? and if you’ve never had one , how do you achieve climax ? i’m 19 and I don’t know if i’ve ever had one .. and i’ve had multiple partners and they were all different but like idk if I have . maybe it’s bc I don’t know what I like ? or if it’s bc I don’t know what i’m doing . and I can’t really talk to my mom about this stuff bc she gets mad about it and i don’t have an OBGYN bc they won’t see me until i’m 21 and I really need some advice please !