People annoy me so much! I don't understand why people are in such a huge rush!

I went to a few stores yesterday to get some last minute Christmas gifts. For some reason that day everyone and their mother was out. I have a hard time walking a steady pace, so I walk rather slow (lol more or less waddle) so I'm walking, avoiding people the best I could. This lady who has a carriage slams into my back with it and tells me to move that I was moving too slow! lady! there's a big space right next to me you could fit your fatass through!!...ugh