Why has my life been so hard? All I want is some relief, its not so hard to ask for.?

Im a 21 yr old woman that's having a very hard time in life. I'm been in a constant struggle to survive since I was born. I work a housekeeping, and I clean 16 rooms per day. Yesterday I was a very tired and weary when I got off work. I dont have a car so I walk a half mile to the bus station to and from to go to work. I decided to stop at the store to get a sandwhich before walking the rest way home. My day was so BAD! already, so to top it off I ran into a old highschool clmate that is doing so great! He's a marine, married and drives a wonderful BMW. I'm not jealous, but my heart did ache because instead of driving off like he did I walked home, I felt embaressed, and ashamed. I looked a mess my hair was out of place. I just feel like im stuck in life. BUT why im a good christian woman, im single no kids I have no friends im always alone. I'm ashamed that I cried so hard when i walked off. I've been trying to go to school for 4 years off and on, and im still considered a freshman