I can't have an orgasm?

hi, I'm a virgin and I do masturbate from time to time using my clit and the thing is it works but when I get to a good point my body just starts to jolt and I have to physically stop bc I can't stop jolting ? like my legs kinda tense up close and my crotch area goes in almost like I'm trying to get into a featul position involuntarily and I can't stop it? can someone tell me what's going on, how to stop and and if anyone's experienced this before?

thats an orgasm.

hi, I'm a virgin and I do masturbate from time to time using my clit and the thing is it works but when I get to a good point my body just starts to jolt and I have to physically stop bc I can't stop jolting ? like my legs kinda tense up close and my crotch area goes in almost like I'm trying to get into a featul position involuntarily and I can't stop it? can someone tell me what's going on, how to stop and and if anyone's experienced this before?