I frequently feel that way too. I remember my mom telling me (and I'm so grateful she did) about feeling that way. She would have dreams that she was walking to high school ~ her high school was on the other side of the river, and in those days girls were not permitted to wear pants, and she had to cross a nasty breezy bridge in the winter ~ and she'd be thinking, 'I shouldn't be here, I need to take care of my baby.
But she also mentioned that sometimes she'd be driving around with me in the car, and she'd think, 'what am I doing? I'm not old enough to be driving and taking care of a kid!'
My other favorite take on that feeling is from Heinlein. In _Stranger In A Strange Land_, he describes a statue of an old woman. Jubal is explaining to Michael (I think ~ he's explaining to someone) that anyone can make a statue of an old woman, but it takes a brilliant artist to show us an old woman while making us see the beautiful 16 year old inside.
Love is that condition in which the happiness of another person is essential to your own...
Robert A. Heinlein
Me: female, bi, (formerly hinge of a vee)
with FirstBoyFriend (FBF)(moderately long-distance)
and no longer with CurrentBoyFriend (CBF)(who lives in the apartment building next door)