You can take off trolls with a bow ...
Its not a bad design that thing just want to kill you for stay in his territory
And you can drop the agro sneaking with some distance
Looks like you didnt prepared to be there , the game its bosses/crafting based so if you are with very beggining gear and go to the black forest ( next biome where trolls are mini bosses ) then you did a newbie mistake just that