Hello and welcome to EmpowHer,
I wish to clarify something before I offer advice. Do you mean that girls give you blowjobs, or that you masturbate?
Masturbation or self-simulation is not uncommon and not necessarily a bad thing unless it is an addiction that controls your daily life style. Compulsive masturbation for example is a problem that you should seek help for.
However, please clarify that issues you are facing more specifically so I can help.