I'm a freshman in high school and I think I'm depressed. Here are my symptoms. Help?

I used to be the closest thing to perfect there was.Now I have an even more rigorous schedule, and sports takes up so much time. I was an anticipated freshman for soccer, and now the other freshman of JV are ping me up, and it makes me more and more anxious and more and more nervous, and now my performance is lacking. I don't play the ENITRE first half. It's disheartening and I feel horrible inside to know that everyone else is better than me when I used to be the shining star. ME. However, the day that follows these practices and games is hell. I get 6-7 hours of sleep because I have so much homework, and my ability to learn in school is suffering, and my grades are dropping. I was a straight A student. So I already feel horrible about this and waking up is really hard for me.My homeroom teacher, Mrs. Kacimia, gets on my case for being a minute late all the time. Then I have to suffer through school and all the teachers I hate, and face all of my friends who constantly annoy me for the smallest things that they say or do. I try not to make it obvious but they know that I'm sensitive and still get annoying. A couple of best friends and I are distancing, and I don't know whats happening. I loved them. I feel like I'm being replaced by other new people, not just with those friends but in all aspects of my life. I'm not the smartest one anymore, I'm not the most athletic, and everything is going downhill. Is this because I have no time to hang and do stuff because of sports? Soccer has screwed me over and I'm failing. I lost my shot of making varsity next year because I've been sucking so badly.I'm sensitive to everything and feel like I have no purpose in this world. I don't know what I want to do in life, and I don't know why everyone is ping me up. I'm not accepted by the girls on my team because I was not completely popular like them, but I'm not a nerd. And I'm pretty, and nice to them, but there are cliques already established. I cry all the time now too, because i realize that I'm in the middle, stuck in the middle of academic strength, social stuff, and my ****** up family life. Maybe its the heat of cali thats getting to me, because my family is from iceland, but whatever, basically I have this feeling of constant hopelessness wherever I go. What is my purpose in this world anymore? Please answer this question, or offer any suggestions, I need help.