I've been an avid meditator for almost a decade now. Sometimes, I get the feeling that I'm in a dream, as if the world is dream-like. But the essence or existence is real, yet the forms, like mom, dad, friends, seem like light dream-like beings, not "solid" like they used to feel before. A few times I get a fear that it's depersonalization disorder as I lose reference in material world, but it passes very quickly as the emotion is usually content, happy and full of love, although sometimes strong fear arises (of losing touch with matter)...

Do psychologists misdiagnose meditative state of mind as depersonalization?

I can still do what's needed from me (like work, responsibilities etc.), the only thing the idea of depersonalization disorder gives is a kind of panic or fear.. it feels like I can choose it though, if I choose faith in the unknown, the fear goes away and I still feel "depersonalized" but without fear and with utter contentness.

If I feel content, should I stop worrying about this being a psychological disease?

I remember Ram Dass saying that Western psychologists often mis-diagnose altered states of consciousness as disease.