I'll tell my story, how I got into psychology.
From deepest childhood I been in situations wehere people seemed illogical, sometimes angry for no reason, didn't valued attention or help I been giving them, reacted completely negatively to extremely fascinating things, were continuing doing stuff in wrong ways even after mentioning problems and proposing better tatctics/strategies, hating me for questioning things...
I didn't knew what was going on, it just seemed normal that humans can sometimes go crazy and there's nothing I can do.
I just chose not to hang with people that much, being on my own and it kinda worked for teens and earliest twenties.
Then I started a business. Bam. Chatting with people wasn't something I could do or not – it was vital, and when it comes to people paying you for anything – that's were they start showing their true faces, they completely stop caring about what I'll think about them, they start being themselves.
Man, people go so irresponsible, so ungrateful, so unappreciative, so impatient, so frustrated it's almost impossible for healthy psyche to deal with...
It was really hard to deal first, but I kept going. Then it was normal, a thing to deal with if I want to make any money.
Then I started to see patterns. In this case people illogically react this way, in other cases they react that way, also illogically.
I started googling some of those cases and found info on a thing called defence mechanisms: https://en.wikipedia.org/wiki/Defence_mechanisms
I immediately spotted plenty of cases I been familiar with for decades, started noticing people falling into psychological defence on a day by day basis, remembered times when I was into defence mode myself. Discovering it was really big and from that moment I started reading books on psychology.
Basically, this discipline is a bunch of observations, like in which illogical mode human goes in that or another circumstance.
If you're going to deal with people anywhere during your lifetime – you'll need to know at least basics, otherwise your life can be really miserable from not understanding what's going on every time something goes wrong.
P.S. I don't recommend formal education though, especially the free one. I currently live in a socialist country and oh boy, free education is just crap.
Your choice though, If you're curious about whether to chose psychology as something to learn in college/university – it's not necessary, online info and several books will be enough for getting practical results.