My guess is that you did most of your side quests on the other worlds and your friends didn't. There's nothing wrong with that. It just means you'll have stronger spells available to fight increasingly harder monsters.
I got to Mooshu at lvl 40 i mean are you kidding me I'm a balance wizard did I do something wrong every one I know gets there at like lvl 30 or something please replie
Your level doesn't matter so stop worrying about it. Everyone plays at their own pace, and my guess is that you've done a lot more side quests than those that get to Mooshu "early." Besides, being a higher level is an advantage; you will be more experienced and have stronger spells. That's a good thing