Sometimes when i masturbate i tend to bleed. Does that mean my hymen is breaking?
Hi and good on you for asking to get more information.
Masturbation is something that is meant to feel pleasurable. Because you are getting bleeding and stomach aches, the best thing you can do is see your local GP or sexual health nurse. It can be awkward asking someone about these issues, but just remember they are professionals who deal with these things every day. You can ask to see a female if you prefer.
Seeing someone will mean you can figure out what is going on and get some information about how to manage it. For information on your local health services, checkout the Somazone directory (link below). All the best.