Please help... is this normal?

I' a man in his mid 20s and i think i've developed a big problem. My ual urge has been growing steadily to the point that i'm thinking about every minute. My girlfriend is tired having twice a day with me and has started saying No some days. This has led me engage in some risky behavior like picking up prostitutes and just having with anyone that say yes. And of course i use protection but i still dont feel protected enough. My girlfriend has no idea and she thinks she got everything under control. No money for professional advice including counseling. Anything over the counter?