Lol, when I say the least harm, I don't mean to the mobs, I mean to a group!

I'm a new player, fairly 'mature' and don't have the mental and physical dexterity of the latest Tekken world champion if you get where i'm going.

I'd like a class I can battle through to max level to experience the game, but as and when I group, I don't want to be "That guy!"
If you rely on me to tank or heal, i'm afraid you're probably gonna die or rage-kick me... or both!

Suggestions? (this could include going back to Minecraft!)