Don’t know if I’m cuming?


So I know this is going to sound really stupid but whenever I masterbate it goes good for a minute then it starts to hurt when I do it? I can only go for about 3 min before it hurts. I only rub my clit I dont get anything out of fingering myself (which is another question I have) am I doing it wrong? I have tried to watch porn on it but it just dosent feel good to me.

Any advice would be very appreciate!