1) What you did was screwed up. You stole someone's medication. You should think about that, and consider getting some kind of help, as you obviously have a drug problem. I'm not trying to be mean, just trying to make sure you realize the seriousness of what you did and what that says about your current drug habit. It doesnt sound like you have any regrets about stealing someone's medication (just because you THINK she didnt care... well obviously she did, and since they were prescribed to her, obviously she had a medical need). All you seem to regret is being caught. You might want to think about that.

2) You just posted a confession to a public forum. I hope for your sake that your posts do not find their way into the hands of the prosecutor. Too late to take it back now, but you should be careful who you admit things to until after this has gone to court. Anything you say can be used against you in a court of law, etc.

3) You need to call a lawyer. And then, you will probably need to turn yourself in. This isnt going to go away. Your best bet is to get legal help and to get yourself into a treatment program. Not only will a treatment program look good to the court, but if you're stealing drugs and are too far gone to think you'll get away with trying to fill someone else's prescription who has a female name... you really need help. In any case, you really have no choice but to face the music. Get a lawyer and turn yourself in. Your girlfriend's friend can't un-file charges. Sure, giving her prescription to your girlfriend is illegal, but theyre not likely to make a big deal of that. They will make a big deal out of what you did, however. You will almost certainly get put in court ordered rehab (which you probably need) and probation is very likely. If you have a prior record, you could go to jail for a little.