I want to tell him how I feel but im scared

I'm just a girl,
A girl who likes a boy
He doesn't know
How I feel about him
It's just a stupid crush

My best friend,
She said it was cute,
You'll be good together
Maybe, but he doesn't know
And he may never

About this boy,
He's nice to me
And he talks to me
I haven't been friends long
And I don't know why I like him

I'm nice to him,
Not many people are,
I wished he liked me
I know who he use to like,
Maybe he still likes her

I'm not the prettiest girl
But I remember
What he said to me once
He said I was sexy
And I was not chubby

I want to tell him how I feel,
But I don't wanna be rejected...
I'm scared of what he will say
What he will think of me
And if that will ruin the friendship