Burning after Masterbation?

Okay so I'm 16 years old and a virgin and I masterbate often. I don't ginger myself, I just masterbate by clit stimulation. I either rub my clit with my fingers or put it directly under the water faucet. Getting started everything is normal and it feels amazing but once I have an orgasm and I cum ... I get this burning sensation in my vagina. It only happens after I cum. Like directly in my vagina hole, it's not like my entire vagina is burning. Does anyone know why this happens? At first I thought it was because of too much soap down there but I realize that regardless if I take a shower or not it still burns.