Blehh, not poking fun of your method.. but go old school.. Kite the trolls with a bow..
Can take them out with out a stam burn.. make fire arrows early on for the xtra dmg..

When your mining, or using anything Stam based, learn a rythm don't just click away like a mad man. Keep a little in reserve in case a mob rolls up on you and you can attack back or bounce.

That being said, once you kill the first boss.. Again, Kite it with arrows, you'll get a stam boost.. Also, the better the food you have, the better stam pool you have as well..

It's not the game, it's just getting used to playing a little different than other games where you get hand held abilities, etc..