I know this pain all too well magenta1524982. I've found great apps, and gotten stopped by the dreaded memory error message. I'm curious, which LG do have? You can uninstall other apps that you've downloaded from the Playstore, but the pre-installed apps will have to stay on the phone. Please come back and let us know if you still need help. We want you to enjoy that phone and not have to worry about all the other junk.
As Mike mentioned above, we want you to be able to use the features of the phone as much as possible but it's not easy to do so if there is not a lot of space on the phone. Let us know what model of phone you're using and we'll see if there are any ways to clear up some space.