Stressed out, iam losing hope and myself

I want to get myself back. I feel lonely and stressed. I want to know whether I have depression or not? Also I need to concentrate on my studies. Many a time I feel like ending myself.but I myself couldn't do that. I feel headache mostly. I want to get myself back to my old character. I am unable to talk to anyone about myself. My parent are busy and friends too. So I need help from you. I need everyone with me. But all are too busy. I had great aims but now I feel I lost everything. I gave all my happiness for my family. Even I cheated my mind for my family.I started loving a person who was my classmate. But thinking about my family and their happiness,when he said he loves me I said no to him. But really I like him. I wanted to get top rank in gate exam but I didn't qualify for it even. I have really put all my effort for that exam, but couldn't even qualify. I lost my hope.i thought my family would be there with me every time.but I feel they are too busy and they don't even think me