500 Days of Summer

For a long time, I have been watching it again and again and I still don't understand what happened but I feel happy.
Let's just fall in love and do stupid things. :)
But how to show should I express my emotions, I can imagine many amazing things I can could do for her but when I meet her I can't do anything. I just become a jack pudding [1], and look stupid. may be Maybe I can make her laugh but it's not enough, I know she wants more than that from me but how is it possible to/how can I do that, how to is it possible to/how can I break (through) the wall between us.

[1] 'jack-pudding' is a very old expression, almost never used today.