I'd say I'm very far from 'chugging along' -- I have ups and downs, I'm high-energy, etc. But I do have worries, anxieties, bouts of sadness, so I'm not sure how to quantify how 'truly happy' I am.

I feel 'average' from the inside, but when I compare my external behavior to others', I often look like I have deeper reservoirs of energy, enthusiasm, patience, adaptiveness-to-pain, adaptiveness-to-disaster, etc. That makes me think I'm cognitively and affectively privileged in ways that give me an above-average number of spoons, wherewithal tokens, stamina points, etc.

I would guess that my median experiences are in the top 15% of a typical American's experiences, but I'm not confident because it might be that people are still having a pretty fun time in absolute subjective terms even when they act grumpy.