Nothing to add to the education advice from me. However I will air a word or two about the depression.
Having lived with someone who suffered with clinical depression, and having a prolonged downer myself due to circumstantial stuff (splitting up badly with her some time ago, and the ever tightening pressure of cash flow and less than satisfactory employment - I feel my life is not my own anymore, if that makes any sense?), I can say this with some degree of certainty: You have to
want things to change. Nobody can do that for you.
Loosing the heart for life/doing stuff is a very hard situation to dig yourself out from and as others have mentioned a cautionary word to; don't bite off more than you can chew.
Little steps are where it's at.
It sounds like you are in the process of formulating a plan - good for you - a plan, no matter how open to change it may be, is far better than no plan at all.
Ultimately, the only strictures in your life that matter are the self-imposed ones. Extreme ends of the scale are a bad thing - you either have no drive to do anything, or you are so driven towards a particular goal that it takes over your life and well-being. Some kind of balance and perspective is usually somewhere in the middle

and if propagating a change in your life is a means of discovering that, then so much the better for you.
Oh, yeh... ignore the comments from people who don't seem to have even a modicum of empathy or basic comprehension skills, which reduces their world to 'face value' only. You might disappear down the proverbial rabbit hole now and then, but imagine a world so flat and mundane as theirs; I'd much rather be the flawed individual that I am than be so facile as to not even realise my own lack of compassion and understanding.