Letter L capital only

Perhaps I qualify
being an L
Capital.

I’m never supine,
I’m always fine,
Erect that’s it erect all the time
never do I bend…
If I’m wrong
I stand the other way around,
Small though but still erect
And
Long  one
lying down,
Yet I am erect
That’s right, L  still
Though small bit
Yet erect that’s; it