Anyone in the same boat as me? Everyday doing the shit I hate, dealing with people I hate. Still cannot satisfy them despite giving all I have got.

Totally forgotten how being happy feels. Can soemone remind me how it feels? Just so I can relive it

Rule no. 1 don't care how ppl think.

Don't do to impress, don't do with expectations. Apply to everything.

Somehow i agreed, especially the "Expectations" parts, that always made people down end of the day.

If you're one to easily get disappointed, have zero expectations.
Also, regarding the people you deal with, I think its important to change your perspective on how you look and approach these situations. Instead, think of all the things that you're learning, or the things you're achieving. To a certain extent, dealing with people you dislike could teach you patience, improving the ways you, as an individual, adapt to these situations.
Always remember no one dictates how you feel, happiness starts with you & how much you want to feel it.
Appreciate and notice the little things that make you happy!