Why am I not surprised about this?

I mean, most people use algebra a lot. It's anything passed that most of us hardly use.

Ok so I said it before I'll say it again. School teaches you basic information for everyone. Because everyone needs to know how to read, write, and do simple math. Harder math, history, social studies, science are still should know but you can get by life without them. After that it really is for people who plan to head into a job/career that you will need to know these things. Just like art class you probably took in jr high or highschool when was the last time you used that info.
School offers this info so you can find out if you like it or not. And if you do than maybe you want toget a job that you'll use it in every day.
Sorry I teach and I hate when kids say "But not like I will ever need to know this."
"Well guess what little timmy just because you will become a fry cook doesn't mean little Jeffrey will, he might become a doctor and so this class is here just incase."

But I still enjoy learning about it

I used it yesterday!!!!!

as an engineer, I can't relate

After a certain point, a course in any one of many other subjects would be more practical for most students.

Life doesn't have an instruction manual. People that ask questions, figure out how to get answers, and then find the best way to apply them are the most successful. You don't stop learning because you graduated. Most careers and many jobs require constantly learning new rules, new equipment, or taking on training to advance in pay and position or keep pace. There are many ways that people can or do use algebra everyday, sometimes unknowingly. On this same internet on which we are there is something called google, another thing called YouTube, and more. In less time than it takes to make a meme, you can type a search to be shown exactly how to apply algebra to life. You will learn many things in your life, how and if you use them is up to you, being able to identify a situation where you can use that knowledge is up to you as well. Not using it doesn't mean learning it was a waste, it means you are wasting a skill you spent time learning. That's again; all up to you.