What I like about your pieces is the emotion that one can feel from it.
I found this poem to be sad. I literally wanted to cry, it most be heartbreaking to see your best friend whom you love getting marry.
This poem shows TRUE love for the author wishes her beloved a happy married life despise not being with her. T_T

My only suggestions are to revise your pieces when you finish writing. The reader will appreciate it so much. :)

I got a secret
that's buried deep within me
like an overfilled water balloon
ready to burst at any moment.

I have been nursing it
since the day I saw you
smiling at me with those
beautiful eyes staring at me,
but the eyes I thought were piercing me
were actually looking past me.

You said I am your BEST FREN"
and my heart started beating
faster than light can travel
but then she came and
you whispered to her "I love you"

I swallowed my words back
I hid it deep inside
but today as I stand
here in the church
my heart is ready to explode
but all I could say was
"happy married life my FREN"