Is this depression?

I just don't really feel like anything is worth an effort (school, friends, etc.)I usually had an outlet for these kinds of thoughts that helped me avoid self-harm, which was music, and playing in a band which is actually getting somewhere, but it's just getting stressful with another person in the band who is my best friend, I've know him for about 8 or 9 years, and a lot of people that I feel that I should have strong feelings towards I'm just starting to hate. I don't know if the reasons that I'm making up in my head justify these feelings I have against them, but I just feel like there's an amount of tension between these friends and family that is just gonna snap if I don't get help. And then there's this constant pressure I feel with school and this feeling of what's going to happen after I graduate (if I graduate) that really terrifies me. I don't feel the effort to do anything important, or be successful at all. I don't really care if I end up washed up in some ally, which is fine, that doesn't scare me, but it always felt like I was trying to impress somebody, mostly my dad. But now that my 4 closest and only friends are (or as it feels) out to put a knife through my back, it feels like life doesn't really matter, and I don't have anything to really live up to. I don't know if this is classified as depression, but I really really really need some advice, I think just even writing this helped me decide on what I'm going to do. I think I might get a phsyiciatrist and talk, maybe get some advice on how to handle all of this. Just please respond to this somehow.