Will ios 7 delete everything?

So I'm planning on updating my iphone 5 to ios 7 and I don't want it to delete things. I have so many pictures I need and apps that have content on them that I need and if I delete it it'll be gone forever. Can I get everything to stay without backing it up because I don't have a laptop to put everything on

You keep everthing

Only the iOS files are updated. Leave it alone until it has fully finished updating and all your stuff will be there as you left it.