Apathetic towards life and very confused? What's wrong with me?

[Torii]

Ok to start off, I'm 17 years old and currently trying to finish high school. Wait, trying isn't the right word. More like being pushed to finish high school for the sake of my future. I know that school is important and without it I'll live on the streets, have no money and die from drug abuse. But the problem is, I simply don't care. I have no motivation to complete homework or get good grades and I don't know why. I want to have motivation but I don't see a point in caring because I am completely apathetic towards my future, my life, my family...everything. I don't even care if I die at the very moment I'm writing this. I don't want to be like this. I envy all those people who have goals, and are going the right direction with their lives. They seem happy. I don't have a reason to be apathetic or unhappy; I have a caring family, a roof above my head, the privilege of a owning a computer...etc. And yet I'm still like this. I used to feel sympathy towards people and would cry over sad news stories, deaths..., but now I don't care. I've had no school friends for 4/5 years now. It used to depress me, unlike now where I won't even bother trying to make friends or talk to anyone even if someone approaches me. The last time I took an effort, they rejected me, which was 3 years ago. I have OCD tendencies, moderate anxiety, and phobias. Emetophobia (extreme fear of vomiting) is a big one. I've had it for as long I can remember and still to this day have it. It's really interfering with the quality of life. I'm extremely health conscious and have hypochondria as a result minor health issues and other unknown reasons (I wish I knew). Sometimes, all I think about is health, nothing else. Other times, I think I'm dying for no reason or something horrible is happening to me (based on how I feel emotionally and mentally). If I saw a lesbian, I'd think I'm lesbian. If I saw a person with learning disabilities, I'd think I have learning disabilities too. As odd as it sounds, I used to think the only time these thoughts would pass is if I vomited which is something I would never want to do as I'm emetophobic. So then I get stuck with believing those thoughts for a very long time. My older sibling tells me I'm just cold-hearted and evil, and I'm starting to believe it. But I don't want to be evil or cold-hearted. How can I get rid of this apathy in my life? Any suggestions? Thanks for bearing through this lengthy description. All answers will be greatly appreciated.