How can i overcome major depression........?

im very very depressed. i looked up the symptoms of depressions and discovered that I have more than five of them. The question is, how to i overcome it? I feel as everything is my life is sucking and i get so jealous of people who seem to have their lives together and appear stress-free. i wish i could become that way....i feel like nothing will ever turn out right for me. my mom talks to me like crap unless she needs something from me. my boss treats me worse than any other coworker....my relationship seems like it wont get anywhere. seems like i may never marry, i dont wanna rush it, however i wish i could understand how other young people around my age get married and live like happily ever after. im stressed out cause im actually willing to go to school near my fiance just cause its near him and offers the program i want. problem is the school is VERY expensive...i have financial problems going on already...with the price of gas i really cant use any of my money that i earn for things that i want. it all goes to a cellphone bill or gas or something for my car....i feel like im trapped in a world that i really dont wanna live in. i understand that after being a teenager, real life kicks in, but boy did it kick in too fast....i almost cant deal. i get angry all the time, i feel worthless, i feel as though things will never turn out right for me, i cant sleep at night even if i have to work very early the next day....sometimes i just want to end it all....is there anything that can help me? i dont wanna be depressed...i wanna be happy again....