Feeling low. Come out of the situation.

I'm having a tough time in my life, relationship. The person I'm with doesn't understands me. My family doesn't understands me. I cry almost everyday because I don't get things the way I wanted. I know everything doesn't happens according to our wish but still I don't get the things I deserve. I feel like running away from the current situation. Day by day I'm feeling like I'm becoming introvert, I don't like talking to anyone or going out. I blame me for everything. I have developed a low- esteemed problem. I get angry very oftenly. I don't feel like sharing my problems to anyone because I feel like they'll judge me. I have developed a habit of self harming whenever I get angry/upset. The things that I do are piecing my thighs with clips or putting my face in a bucket full of water or holding a knife tightly. Kindly tell me what my problems are how can i come out of the situation.