I completely understand what you're going through. It's hard to feel like you accomplished something if you're not satisfied with life.

I didn't accomplish any of of my goals. I never graduated college, never married or had kids, and ended up losing my home to foreclosure.

If you're not content in life, then find what makes you content. Possibly a new hobby? A new social group? Keep searching, and you will fall in love with something you never knew you liked.