Drinking alone ?

Is drinking alone a serious thing? i’m 19 and i’ve been drinking alone in my apartment for several months now and I’ve been drinking more and more these past few weeks (often vodka) until i fall asleep. i’m pretty sad when i drink but it’s one of the only ways i can pass the time in the evening. last night i threw up in my sleep and i didn’t realize it until this morning. i don’t know if i should stop or how i should go about it. i don’t even know if it’s normal. thank you in advance and sorry for my english.