Broken into

I am now one of those people that has been broken into.....
This morning I woke up at around 7:00 to get ready for class at 8:30. I heard Jess call out my name and so i opened my door. She asked if I had opened the window in our bottom room. (our apartment is two stories we sleep in the top two bedrooms and since kenz moved out we have a vacant room downstairs.) I said No, and that it was kinda strange. She said that the window was wide open and that the door was a lil opened. I started to get a lil worried....I went to go upstairs and on the stairs was a wallet. I then went to see if anything had been stolen from my room. Nothing. Jess asked I had left my laptop downstairs.....I had......
I am so angry and feel so violated.....my laptop is gone, all my pictures from christmas and on are gone......my brand new laptop is gone......all my photoshop stuff all my pictures I edited are gone. GONE! There was a man in my apartment last night, who knows if he opened my bedroom door. He could have taken my purse since it was right there next to my door. After this we walked into the other room and there were keys for our apartment. They had broken into the managers apartment and a couple other apartments.
How can people do this to people? I know it happens all the time but I never thought it would be me writing about it.....Luckily my awesome dad is coming up to stay the night tonight. I love my parents. I am grateful that nothing else happened...but still really really mad....and sad.....
Kaylie