Sometimes when i stop girls that are walking during the short convo they eventually interrupt by saying i "i have to go" or continue walking while i'm talking to them. When they do this what should i say/do?

Take it as a hint and buzz off.

nothing, they are not interested.
when a girl walks away from me, I just stand there and look at "the camera" (I imagine there is a camera there filming all this and I look at the camera like "WTF just happened?") I learned this from some pick up guy on youtube who literally had someone filming him and every time he got rejected he would just look at the camera. that's all he did, he would just stare at the camera. but his camera was real, mine is imaginary.

You should move on with your life.

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Don't take it personally and just go enjoy the rest of your day.

My question to you is: are they actually having a real conversation with you or are they just being polite and humoring you for a few moments before they walk off? Either way, people have things to do. If you're bold enough to have a conversation with a woman that you don't know but you are rambling about nothing that will make you attractive to her or being too bashful to lead the conversation anywhere, they will walk off. Don't put them in the position of being the one that has to make the offer of anything because most of the time they won't do the offering.

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Hilarious! Hahaha

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lol! does it go like this? http://replygif.net/1408.

You should really stop that.

Op, just walk with them. If they're walking and your at a stand still they won't stop to chat. You need to walk up by them and continue to walk with them. If they shoot of into a store it's a whole other situation entirely.

No, I imagined a more "dumb look" starring at the camera for 15 seconds

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It was an expressionless look. no smiling, no frowning, nothing.
I just googled "man looking at camera" this is the closest example I could find.

Does the Curb Your Enthusiasm theme song play in your head whilst making this deadpan face?

yes! how did you know?
actually, I had to look up that show, never heard of it.