I am trying to finish up my first pc build and unfortunately just when I think I am done, it won't turn on. I do not have any

do you get any lights on the motherboard? is the power switch wired correctly? is the switch on back of the power supply flipped?

You have give us ZERO information to work with. What parts are you using? We need more info.
 
 
If any of the things that you mentioned or anything in general is not plugged in "correctly" then yes it wont probably turn on. Best idea? take it all apart slowly and if you notice where you went wrong before you get to the end when all your hardware and components are arranged around you then great 😀