I think from the way you asked, you might go to rehab for the wrong reasons. Go on to AA/NA and get face to face support. Keep in mind you did what lots of people do, "more research" Now you have the answer! You are so lucky to be learning this so young.
It is not easy getting and staying sober, but it easier than what we were doing.
I have had a few ups and downs. You learn. It is OK.
Also, forget your pride etc. Nothing we do getting sober is half as embarrassing as what we have done under the influence so go talk to someone! Maybe start by calling one of the counsellors from rehab. Do you honestly think you are the only one feeling like this? The counsellors might even have done it! Oh, and keep coming here! Let us know what is going on. Big hugs.