What would happen if I deleted all my data used by Google Play Services? Unfortunately my phone has a total space of 5.52GB with no place for extra storage ... Sad, I know.. However my phone is constantly rejecting texts and won't keep an app open for more than 2 minutes without crashing. I clear my cached data almost every ten minutes. My phone isn't full by any means. I only have Facebook and Snapchat as apps and only 168MB of pictures and videos.

So I decided to dig a little deeper to figure out where all my storage is and under my Google Play services it says I have 3.9GB just there! What I'm wondering is what exactly Google Play Services entails. For example, what would I be losing if I cleared all of its data? Would I lose pictures and apps?
Google Play services offers APIs to other apps. Data used by Play services is mostly cached data for these APIs, duplicated data of Android wear apps synched with your phone and some kind of search index. If you delete this data, chances are Google Play services will just recreate it, although 3.9 GB is really much (mine only use 300 MB). But you won't delete any of your personal data by deleting Play services data.