miserable!!!

This may sound a bit weird, but... Is it hard for Ты to breathe? Try to breath in slowly, and really deeply. Then breathe out again. еще often than not, this will make Ты feel alot better.

And I get what Ты mean. I'm in a likewise situation myself. What I tend to do to relax, is lie on my постель, кровати and doing nothing, and just listen to calm music. I excersise alot too, often with others. My Совет is to Присоединиться a group excersise. It sounds tiring but believe me, Excersising is a great way of relaxing, and meeting new people.

And this may not sound very helpful but, I feel for you! ;)

Depression can come at any age and for any reason. Small trivial things can trigger and major depression attack, even something as small as not having your favourtie рубашка washed and dried in time can get some people down in the dumps so bad they want to end their lives.

It sounds to me as though Ты have very severe depression. I'm not a medically expert, i'm just telling Ты what it seems to be to me and my experiences. I suggest Ты go see your doctor, explain how you're feeling and could he please see if any anti-depressants will help and also see about councelling. Ты may not think Ты actually have any problem other then this depression, but it has to have a reason, and a psychologist can help unearth that to get Ты on the road to recovery.

Is the dream job actually what Ты want? It seems like it is, but is it really when Ты get right down to it? Is the pressure of getting all the work done and not connecting with your peers getting to you?
if the workload is too much, try talking to your tutor and ask their advice. As for the problem about not having any friends, Ты have to admit that is partly your fault for not engaging them in conversation. Take it slowly, pass someone in the hall and say hi. If they're in the same subject and you're not sure about something ask for their help etc.

To calm yourself, Ты can always take a big breath in, and then exhale longer then Ты inhaled. This will make your сердце насос slower, calming your nerves and shutting of your adrenilin.
Calming teas, fresh fruits and veg, plenty of sun-shine and oily рыба once или twice a week such as лосось или tuna, can all help with a well-being inside Ты :)