Who am I?

I am light made of the darkest shadows,
A pessimist made from the most optimistic qualities.
I am spring rain on the ocean that is calm and torrential in one,
I am the scent of sweet candles in warm bubble baths with steam and soothing salts. 

I see emotions in people's faces,
I read them when they aren't reading me,
I look between their eyes and somehow know,
Who they are. Or at least a small shadow of them. 
I am an observer, a quietly sarcastic emoji-using younger sister, and spontaneous dancer and a short-tempered girl. 

When I look in the mirror, I see my few dark freckles, 
And the lines where my glasses are all day,
And my brownish hair and my dark eyes,
And I see uncertainty and loneliness too. 

I cannot survive without laughter. Who can?
And when tiring beachy days mix with warm, soft nights, and cozy sheets, and hot mornings and bare feet and aquariums and cousins and banana bread, I will be there, drinking milk and most likely smiling. This combination of things will be where you find me, happy. 

Who am I? Honestly, I can't tell,
But if you meet me, you might find me searching the place between your eyes,
Trying to figure you out.