How can someone with hyperventilation overcome depression and lead a healthy life?

Hello doctor,

I would like to tell you my problem and seek a solution from you. I do not have a peace of mind. When I go to college, I am completely fine. When I am alone or get back home some or other matter irritates me continuously. In spite of my knowing that it is not good to keep it in mind, I still do. I cannot take it out of my mind. I am a skinny girl that makes me feel bad when others talk about it and when I see others are good-looking. Not that I am jealous of them, but I want to be normal. I was and am in a relationship where now the guy says this is not a serious one, he is busy all the time. I expect him to give me time at least once a week which he cannot do as he was saying he is busy for two months. A lot of stuff that he has told me reminds me I cannot have a fresh start. Overall, I am depressed. When I am with friends, I am completely unfocused and I spend time on social media. I cry too and want it to stop as it disturbs me. I cannot study and I do not show it to others, but I am highly disturbed inside. I want to be normal without any expectations. I do not want to depend on anything, and I do not want to feel like I need someone whatsoever. How can I cool down?

Thank you.