I Need Help

I have a problem with deliberately sinning. I do not know how to stop. I will sin and then feel bad and ask God for forgiveness and then I will be fine for a couple of days and make the same decision as before. I have stopped Lying and I no longer steal. But i still have a problem with Fornication,Masturbation, and just lustful acts and thoughts in general. I dont want to reach the point that God can no longer forgive me because of my choices and that is what I am scared of. I have tried praying and asking for guidance as well as talking it out with my Christian friends but I can not stop. I want to stop. I want to give my life to God and actually mean it. Not just give my life over to God because I am scared to go to Hell. I mean sometimes I feel like I mean it, but then I go out and fall right back into the same sinful patterns as before. I know it is wrong. That is why I want to change my ways and give myself completely and whole heartedly to God. I do not know how to go about it.