Re: I think I am an addict.
As it is said, you can get addicted by just taking it once! It is often peer pressure which can get people into taking drugs, thankfully I've refused when offered drugs, but I've known people who have gotten to rock bottom from taking drugs.
My advice would be to cut the lines between the peers taking/supplying the cocaine, if you get out early it will be more easy to recouperate. Try taking up a hobby to focus your mind on something else apart from the craving for cocaine.