Pain after Masturbation?!

So I recently had masturbated and afterwards and I had this pain in my belly and I felt pain down there. This normally happens at times and I don’t even know why it’s happening. I’m 16 soo I get uncomfortable about telling anyone about it but please help me, I just want masturbation to be pleasurable 😪😞 ( I push out my stomach and it’s painful down there in the um hole)..