I mentioned those addictions only as an analogy to being in love.

Depression is not like an addiction. You are right, depression sips so much energy and focus and makes simple things difficult.

Sometimes there is a reason, a cause, for being depressed. If this is so, it is easy to solve.
Sadly, sometimes there is no (apparent) reason. In that case I think you really need professional help to get through it. Two years is pretty long. I have been really depressed in the past for 2 months. That is intense and it gave me physical symptoms.

While my grades have been suffering from my crush, my physical fitness for sure and my social interactions probably also, have improved. I try to give a positive twist to it.

Ideally, you should use these mental crises as catalysts of change. But, often it is not obvious how.
You don't give us much information about why you are depressed, what you enjoy in life, and what you have problems with. To me at least, it soothing to write it all down. It barely makes a stratch, but it is something.