Some people say that depression might be uncomfortable but it’s not dangerous.
They are wrong. Depression is dangerous and there is a chance of suicide. You are saying that you are suicidal; you must discuss this with your therapist. It is dangerous to be so depressed.
You say that your height is your main issue; it is not. It’s your thoughts about your height. You are depressed and thinking about your height. You are depressed and thinking that you don’t have friends. It’s your thoughts that are killing you.
You need to learn to have new thoughts; that is the theory of CBT. I assume that you need medication. (It might be helpful to be monitored while you start medication and your Dr. might want to hospitalize you. It’s not scary, its just full time care.)
You need to learn skills, the most important one is not to think the whole time about other people. What makes you happy? Do you like to work with your hands? Do you like to read a book? Take a walk? Learn to be happy on your own. People skills will come as you find something that you like and are good at you can interact with people in your comfort zone. You are the only person responsible for your happiness. Let’s say that again, you are the only person responsible for your happiness. Go find ways to make yourself happy.