I have hardly any space on my iphone? - 1

I have an iphone 5c 8GB. When I got it it had 5GB avaliable for me to use for like appsa and stuff, whcih is normal. But now I have only 500 MB left. When I go to internal storage it shows me all the apps I use and how much space they are using. But it only adds up to like 600 MB! AI have only updated my iphone once! From ios 7 to ios 8. It didn't even use up that but space! I still had a lot of GBs left! I share an apple ID with 3 other people. I've given all the info I know… Please Help! I have hardly any space on my iphone

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"I share an apple ID with 3 other people."

Maybe that's the real problem.

Each of you need your very own Apple ID. This gives each of you 5 GB of FREE iCloud storage for backing up your iPhone.