How to know what I am feeling?

Here are some examples I can think of when I am feeling and what I might do:

Happy - smiling all the way and with a radiance of glow around me!
Sad - what some people call 'black face' or a stoning face.
Afraid - looking around non-stop and lots of movement
Angry - ultra 'black face' and maybe you'll be able to see smoke forming above my head. But most of the time, I'll just curse and swear non-stop.
In love - hmmm a tough one, but most of the time, I'll just keep very quiet and maybe trying to have that 'watching by the fence' approach first.
Shy or embarrass - my face would most likely go red a little and avoid eye contact with that person.
Blur or confused - it will spell all over my face, most of the time.
No bothered - most of the time, I'll just close my eyes.
Focus - most of the time, I'll look very fierce as though humans have offended me. But it's just me concentrating!
Playful - I'll get 'high' and start to talk nonsense and smile a lot.
Irritating - I'll generally piss people off, as I will just keep on pestering them over and over again.

So if you see me doing things that I have listed up there, the probability that I am feeling that way is true. But occasionally, I've to put on false smiles to cover up my emotions. After all, when you work in a service line, you have to hide your emotions well to avoid customers from misinterpreting your actions and words.

Generally, these days, besides changes in me, I'm feeling blur due to lack of information that I am obtaining regarding my studies. It seems like I have not been keeping track of the online quizzes and project datelines. Hopefully, I'll be able to follow up soon or else... I'll be lagging behind the other students.

Moreover, I would like to thank 3 ladies for keeping me comforted and been caring for me during this period of time. A clue for the 3 ladies starting with (in no particular order) F, G, S. Thank you for your cares and concerns, I'm fine now (I hope so). Just need a little more time to recover bit by bit. I'm still waiting though, for that one person (Y I Love You beiNg your owNself)