Nobody can patten a chord progression. Songs are being ripped off all the time and it sounds in no way intentional for you to be ripping off these songs.

I think you will be fine. The music you are making will always come out different. Once you throw in a bass player and a vocalist and a drummer it gives everything its OWN sound which makes the uninqueness of the band.

If you wanted i'm sure you could expand your creativity...listen to a band like Dredg, they are extremely unique and creative.

Simple music works a lot too, bands like The Beatles or Coldplay all use pretty basic stuff but it still sounds unique and good. (To certain people)

Anyway...I admire that fact that you have that quality in you, if i write a song that sounds like another song i usually try to change it too. So i too have the same fetish in hopes i'll be extremely unique and admired someday ;).

Good luck. :)