I Am currently struggling with alcohol and don’t know what to do.

I’m 20 years old writing this, i turn 21 in January which is next month so i’m not even legal to drink in the US but the last 2 months or so since labor day weekend, i had a couple drinks with my friend that made me feel great. Keep in mind, my friend is of age (so it’s easy for him to get alcohol), i felt kind of guilty because after that the next 4 or 5 times i made him go to the liquor store to by me a 1.5 liter of whatever for myself for the week. After he started pulling back when he realized that’s what i was using him for i started relying on lying to my parents to give me money and i’ll hit up another friend that’s 21. This is when i started to think I had a problem but ignored it, all of October-November i was drinking and when i ran out, went in my dads cabinet and sipped on whatever he had to get that feeling. Lately in december i’ve been feeling just scared and sad, and of course i drank but i don’t wanna keep living like this, i just got a new job so i’m getting money and the first couple paychecks, i went to a liquor store that doesn’t ID to pick up Tito’s. Without alcohol i feel scared, without friends i feel lonely, i need some feedback on how to fight whatever is going on with me, any advice will help. I even started picking up going to the boxing gym and been going but even after that i crave to drink alcohol at night.