Early dungeons are easy to make sure tanks and healers who are just starting are able to cope with it.

For example, as someone who had only ever played a tank, I always wondered how hard it was to heal. So I made an Astrologian to see. They start at level 30. I went to do some level 30 dungeons with that, and was appalled at how I BARELY EVER had to heal my tank. It seemed to easy. But I know later on how tough things get for healers.

So don't worry. Things will start to get more challenging and you'll feel a lot more useful to your party later on.