Gore Magala?
With the informations given, I assume that you're at Low Rank? The weapon is too weak, though. It should be lv4 at least to be able to inflict decent damage.
Anyway, for every monster, not Gore Magala alone, the only advice is: carefully study its attack patterns and movements. YouTube could be a great help, since you will be viewing as the second perspective. Monster Hunter is a nasty RPG. You can't just rely on your gears and blindingly charge into your foe head-on.
Learn its moves, study your moves, and figure out the way to evade then counter. A Quest gives you 50 minutes, so don't rush. Take the time and it will be done.