Samsung Captivate, Otterbox, and screen protector question?

Alright, I have a Samsung Galaxy S Captivate smartphone-the screen being gorilla glass. For said phone, I purchased an Otterbox Commuter series case-but upon putting the screen protector on, I realized there was bubbles- so took it off. Tried again- now their was lint. I ended up taking the screen protector off-but my question is this. Do i need a screen protector for this, or am I just really paranoid? I