This is a bit of an issue for sure especially if you are solo, You can often lure them back to the entrance and get to a place where they can almost not reach you and cheese them.

You can also kite them around areas you have already been. Also, make sure you are using 2 health foods, 1 stam, have health potions on you and the bonemass buff.

What armor and weapons are you using if I may ask?

You might be doing all these things by no means am I trying to say you are not I do remember my first time I died in 2 hits to a 1 star seeker and made a similar post but I was not using the bonemass buff and my food had run pretty low so I only had about 120 health.

These are more or less just checks to make sure you have these things.