Welcome here to the Support Forum, I think it was a good idea you came as you may be able to talk to others and gain a slightly different perspective on this last year.
I would not agree with you it was a waste - not at all. You have a uni degree and that tends to show intelligence, capability and endurance- all highly important. You are a capable person and have the ability to learn -about yourself as well as uni subjects..
Now, you bit off an awful lot to chew when, straight out of uni you left the supportive environment you were used to, from family to where the local petrol station was.
You moved into a strange and unfamiliar environment where you basically had to set up house from scratch unassisted.
You started a new job that was taxing, maybe you first experience in the serious employment arena, and found it hard when put together wiht everything else in your life. Although this was noticeable to others who offered support you tried to sort it out for yourself.
Then there was an interlude where you found a person you became attached to and entered into his life. Sadly although things had seemed to be getting pretty good you found gambling, drugs and alcohol were affecting him and in the end your relationship finished due to this. Unfortunatly with that the social life you had built up in his world came to an end.
Now another factor has entered, your work is not a happy environment, and I suspect due to being overloaded you have not performed as well as you would like. It is worth pointing out that your co-workers are finding the same and trying to take action.
I guess true, you feel alone, and that your old home and family seems terribly attractive right now.
There is one thread that runs through this - apart from it being perhaps a little too ambitious for change at the start - that you have not accepted help, perhaps partly from embarrassment, and partly as you might be thought a failure.
May I suggest you do accept whatever support you can, it makes the world of difference, and being able to speak frankly not only shares the load but gives opportunities for others to contribute ideas.
With more than one of you -family or friend from the past perhaps - it will be easier to face the problems you have and deal with them. You even may find someone from your workplace you enjoy being with.
So what do you think? .