If my dad claimed me without me knowing will it stop my federal taxes I'm 39 years old

[AnnetteB6]

If you have already been claimed on another tax return and you file your own return later, yours will be rejected by the IRS unless you indicate that you have already been claimed as a dependent when you are filling out your return.  

Having your return be rejected is the only way to know if you have already been claimed on another return.