Why do i have to pay 170 dollars to fill my taxes

You appear to be using Online Self-Employed Edition which is currently $90 for Federal and $40 for State (if applicable).  If you choose to pay any fees out of the Federal refund, there is an additional $40 service fee ($45 for California filers.)   The last fee can be removed prior to filing and then one can pay by credit/debit card or a prepaid debit card one can buy in a store.  If you haven't filed, we can tell you how if you want to switch payment methods.

Did you think you were in one of the lower editions?  If you haven't registered, paid, filed, you may be able to downgrade depending on what particular forms you need in your return.  The Self-Employed Edition is mainly for folks who need a Schedule C with expenses for self-employed business, independent contractors, etc., or for Schedule F (farms).   What edition did you think you were using?   Some editions have form limitations of various degrees.