A little help please..?

Hi I'm 15 almost 16, I have left school a month now, and have managed to get myself a job with four shifts a week, I am also revising 20 hours a week in preperation for my college couses (UK college is after school) I just feel so depressed :| I'm addicted to sleeping pills and cough medicine containing Dxm, I drink alcohol alot to escape, and I always cry for no reason I just feel so down in the dumps : ( but the thing is theres people who have things alot worse and i shouldnt b complaining. I want to go to the doctors to see if they can help me stop feeling so low, but i feel bad because people have it worse "/