Filing tax

I have to file my US tax but I don't know how to. So I need to pay some accountants to help me figure out how much tax I'm supposed to pay.

That means I'm paying people to tell me how much to pay. Or maybe I'm paying people to tell me I don't need to pay. 

I feel like a tax filing service should be covered by my tax payment. Like if I eat at a restaurant, the restaurant tells me how much to pay. They don't make me figure it out myself. Or they should get prisoners to file taxes for people. Then accountants can do something more productive.

Maybe I'm just too lazy. Or dumb. I dont get how this system works.