Am I just weak, or are they too strong?

One thing I've noticed while battling (Yellow)enemies is that I'm having a tough time keeping my health up and the battle prolongs for what seems forever... Light blue is easiest, Yellow is average, and Red is (more or less)impossible. Now, is the game pretty much forcing us to learn Cure(Conjurer) so we can have a difficult time in battle, or am I just doing something wrong? (Rank 12 Pugilist with most active skills of Heavy Strike, Concussive Blow, Seismic Stomp(?), as well as healing abilities Cure, and Second Wind. Any advice would be appreciated.
Also I just purchased new armor and weapon so I am up to date.
Also I focused most my Attributes to Strength, Dexterity, and Vitality.

When solo, enemies with a yellow icon are generally going to be tough. Try to stick to enemies with green and blue icons, at least until you have the physical level to simply pound through things at lower ranks very easily.

The first class is always the toughest to level, so stick with it!

Yea, once you reach Plvl50, your the next lower class you try to level will be cake, especially since you will also have skillz from your first class at your disposal. I felt really weaksause when I just started too.

Ganbatte ^^