I have hidden alcohol in my room
Why do you feel the need to hide it?
Mostly to hide from my mom what am I doing.
If you have to hide it, do you think that it is a problem? If you feel comfortable, you should share with your mom how you are feeling.
It's fine. I know mom will get mad or freaked out.
It is wrong to drink underage and hide things from your parents. There could be serious problems if you develop and addiction.