by the way you've played (smithing, enchanting, random schools of magic), you've moulded your character into one that prefers doing those things rather than combat. Thus, the character you're created is currently not good at combat.
"You are what you play" isn't just a fluffy PR line from Todd Howard. It means something

If I level up speechcraft and pickpocketing and sneak and lockpicking, then the game knows I want to play as a sneaky thief. Not as a troll-killer.
If you want to be a troll killer, then make sure you kill stuff while you level up. It'll mold your character into a killer.