Everytime I write, I feel the need to find the exact 'right' word?

You need to tell your inner editor to shut up and terrorize someone else. If that doesn't work, (and it usually doesn't) then cover up your computer screen so you can't see what you're writing. The first draft's allowed to...well, bluntly speaking, suck. You can always go back after it's written to fit in those perfect words.