I made an account here after ages just to reply to you. Bro don't kys. This, too, will pass, if you just wait and hold the line. I was in some shit places too before, I am a college dropout (dropped once, failed twice so 3 years down the drain while I was having barely any money and will to get out of bed - that is why I failed) and I am shit with girls and always been so. But I pulled through and I can see the light again, changed jobs, changed areas within my city, stopped living with mom as we were arguing about cleaning and she got me nervous as fuck, and now I have a comfy job with home office any day I like - got more social too, not to an extent I'd like but you have to work your way up, right?
Turkey is not generally a very good country from what I've heard but it is not the worst either, it has to be manageable somehow - perhaps you will get a raise and that will help? Just don't overwork yourself of course, slaving away for cash is only acceptable if you are starving (which I hope you aren't).
I feel like you are a decent, nice person that has it tough as fuck, and when decent people get it rough it makes me feel just remorse that there are shitheads out there that breeze through life while great people suffer. But the only thing we can do is fight until we are beaten for the final time, and for you, the final beating has not yet come. Start from the basics - you get up from your bed? Success, you cleaned your room for 30 minutes? Success, and work your way up the problem ladder. You seem intelligent, you will find a way, I believe in you bro.
You are right in a way, though, about the pain. Pain also gives you context for happiness like darkness gives context to light, and death gives context for life. It also shapes you like a merciless chisel. But think about the ones that just slide through life without any pain - usually they are not considerate, empathic, etc. I know this is shit consolation, but steel is made in fire. Be steel.
Also, huge props for Dark Tranquillity, I only now earn enough money to consider going for those level of bands and I would looove to see them eventually. How are they live?