Am I depressed or am I just stressed out?

I've been feeling like maybe something was wrong with me for a couple year now. Recently I've just been in and out of mood swings and most of the time I feel worthless. I don't want to be with my family because I don't feel like they want me. When I'm by myself I end up feeling guilty, sad, and alone. I've even contemplated suicide. But it's weird that I'll just crash but maybe a few days later I feel this happiness high and then it goes away again. I also noticed that I'm not sleeping as well (I keep waking up so early then I can't go back to sleep again, I'm so irritable, and I get headaches a lot. I'm not sure if it's depression or stress maybe both. I just feel so shut in. I internalize a lot of my negative emotions, I get stressed out so easily. I think maybe my family life is just so frustrating to the point where sometimes I feel like a stranger in my house. My dad's a drunk, my mom doesn't want me to be "weak" and doesn't believe in depression so instead of talking things out with me she tells me to be strong and don't be a victim. As much as I try to pick myself up there is feeling of such powerful self loathing that it makes me want to die. Am I just stressed or am I depressed? please help.