Hi Sushigirl thanks for reaching out
I'm 24 and I've known for a while now I've had a drinking problem. I started drinking at 14 with friends, we would drink ridiculous amounts and have fun and get in trouble. They grew out of the binge drinking, I didn't. I can relate to that the only difference being that I started drinking in my adult life but my drinking was visibly different to the ones I was around. When we're young its not always easy to see the difference as everyone do at times drink too much so knowing (as you do) that you have an alcohol problem is definitely a positive sign.
I don't know if she's noticed anything but she doesn't mention it.Its been my experience that the ones around me knew long before me that I had a problem. They also knew when ive had a drink as they said my personality changed. My hubby for instance would walk in to the kitchen and without getting close to me or seeing a drink or a bottle he would look at me and tell me that ive been drinking. I could never understand that so one day I asked him about it and he said my eyes changed. Thinking I was clever after having had that knowledge I started wearing my glasses more often but even if he didn't notice anything after that, the only person I was fooling was myself. She has possibly not said anything yet as you may not have graduated to the level where your drinking is affecting her environment - i.e causing arguments with her or possibly even between her and her boyfriend. Should you choose, however, not to do something about the drinking that level is definitely in your near future. Alcoholism is a progressive disease - it doesn't get better if we don't do something about it. It only gets worse.
I don't know whether I should admit it to my housemate, I'm scared what she will think.As explained above chances are she knows already. What it could do by admitting it to her is that it could remove the fear from you which could make it easier for you to change course. I have found that secrets hold us hostage. Once a secret is no longer a secret that fear is removed and we can merrily skip along if we so choose. The only way to find out though is to open up and tell her and by doing so to remember that you can not dictate her reaction and actions to the news but that you CAN control how her reaction or action is going to make you feel.
I don't want it to be a permanent problem, I want to still enjoy a drink with friends at the weekend, but I don't want to need it and I want to stop drinking on my own. I'm going to my first AA meeting tonight which I'm pretty scared about, but I just want the cycle to be broken at last. 
Every person who is an alcoholic wished we could do that hon. Unfortunately that is not how it works. Alcoholism is a disease - an allergy. The easiest way it was explained to me is that some people can eat peanuts and some cant because they're allergic to peanuts. The person who is allergic to peanuts perhaps enjoyed peanuts for some time and then became allergic so the next time he/she ate peanuts there was an allergic reaction. If this person went to the doctor for tests it would be found that he/she is allergic and it would be recommended that person refrains from eating peanuts as the next time could be death. If that person values his/her life they take heed. If they don't, they continue eating peanuts and suffer the consequences. In my mind its a bit silly to continue eating peanuts if you know you are allergic
I think a lot of it is down to boredom and feeling quite hopeless in life because I don't really know where it's going at the moment, I also suffer from anxiety and have recently been prescribed anti depressants which I've been taking for 5 days so far. If I ever feel unwell I panic it's from the drink and make myself even more scared but that still hasn't stopped me.Why don't you be kind to yourself and give yourself the right to live and possibly become free of one fear - alcohol and face the rest as it comes / if it comes? You are clearly young, beautiful and smart with your entire life ahead of you. Break free and become the person who you are supposed to be.
Good luck and believe in yourself. I do.
Lotsa love and light,
Noels xxx