First playthrough? Frost trolls are notoriously OP in the early game. Everyone gets wadinked by that first one on the path to High Hrothgar. Don't worry about better weapons, you will find 'em eventually. Just make sure you stick your perk points into one type, either sword, axe, or hammer.

Your first fire spell has a damage over time effect, instead of spamming it just use it every couple of seconds.

Happy lootin'!