I want to tell a girl that I like her.?

Greetings! The situation is... I'm 25, she is 23, my colleague from work and yesterday I said her that I want pizza to eat and asked if she is going to accompany me or not. She agreed.

We went there and spoke for about 3 hours after that I took her to the entrance of her house and left. She looked at me somehow strange at the end.

Mostly no touching, no kissing, nothing. And I have a feeling that she is quite friendly with me but there is some distance. Or was it my imagination?

Anyway I'm quite clumsy about social stuff and courting(only autists are worse than me I guess) so today I decided to make it easier for her. And me.

I'm going to tell her what I think, that I like her and after that ask her to go somewhere like a cinema or whatever. If yes then fine if no then ok, I guess I will survive.

So that is the plan. From my point of view it is good.

What about reality? Is it so good go straight? Would a girl be ok with such a narrow method? Anything I should be careful about?

I would be grateful for any advice.