As the pizza hoe mentioned, it's very country dependent. Where I live, therapists are, like other medical specialists, paid from taxes, so free at the point of use (not all of them, they need some licenses etc.). Or you can pay for them out of pocket if you want.

I agree but this is very location dependent. I live in India and an hour of therapy session costs around 15$(average bill if two people eat at a normal restaurant to put things into perspective).

If you can't afford that, don't worry as many not for profit organisations exist which will help you with free therapy. But this comes at the cost of therapists who themselves are paid like shit. But none of this applies to my friends because their job is ready to pay(your boss can't find out you go to therapy btw) in case they want therapy but they still are hesitant. It's more to do with how people will perceive you if they hear you're going to therapy.