Motivating advice or quotes?

Well to make a long story shorr i have a horrible life. My life is just so full of negativity. I have no dad and im the only child, so im lonely alot. I have friends but none of them get me. I have been rejected my whole life and suffer from low self esteem. I was however in two relationships in my life. One this girl became my girlfriend, but i later on found out she only went with me cause she felt sorry for me. The next wss a girl i became very close with, and gradually got feelings for her. But of course she didn't feel the same way, she said she wanted to just stay friends cause she didn't wanna "ruin the relationship" but i known it was just an excuse cause she didnt want to tell me im ugly. I think she's still obessed with her ex, and she only calls me when he iisnt home. I think im actually jealous of him. Im just so angry, i am the underdog. In every situation, i'm the loser. Im gonna kill myself, but i seriously hate my life. Can u give me some motivaional quotes plz? =]