I actually suck at the combat portion of this game too, and wasn't sure how I'd fare against the dragon. Turned out to not be that hard. Enderman that I accidentally looked at tended to be the biggest annoyance. I had to climb the towers to destroy the crystals (suck with the bow) and I just crouched on the top of the last one while the dragon flew around. He'd fire at me a couple times which my enchanted diamond armor shrugged off then he'd swoop down and hover over the end portal/egg. Gave me an opportunity to hit him two or three times with the bow before he'd repeat the process. It was all over in about ten minutes and I only had to use one healing potion when a group of endermen gang rushed me. You should be ok.
Okay cool! Thanks @bloodyphoenix @andhe78
I know the pc version is pretty hard but it seems the xbox ender dragon is easier to defeat.
She's actually harder to kill on Xbox. Compared to the Xbox version, the PC enderdragon is not difficult at all. It only has 1 attack (Rams into you) and runs away most of the time. None of the Ender Crystals are covered by iron bars either.