I desperately want to hold her hand
What makes you want to hold hands with her?
I find it to be romantic. I want to know how she feels about me.
You have a romantic trait about you. Be less obvious though so you won't loose her. She isn't a person to be overly sappy with romance, you could be more subtle instead.
Why should I hold back? I just want to hold her hand and she can't say no.
I just don't want you to seem desperate. Try using subtlety, I think it will be better.