Why can't i commit?

Why can't i tell you how i feel?
Why can't i let you in my heart?
I love you so much,
But yet i can't say,
I been with you 4 months,
And yet i can't commit,
why can't i let go?
To the happiness you make me feel,
I want to spend my life with you,
Yet trusting you is so hard,
I know you love me,
You make that clear as day,
Just give me time,
Then I'll be yours forever.