Why are we forced to take useless classes?

There are always choices in life. Not always choices we want, but choices.

You chose to attend a school that had core requirements. You could change that choice. You could opt out of college entirely, or choose to attend a school with fewer core requirements. Of course, those choices may bring about higher expenses, or an uncomfortable change from an environment in which you’re comfortable, but you do have a choice.

No one is “forcing” you do to anything.