Every time I spawn I spawn in the air?

I really don’t even know what happened. I finally got my computer to run Gmod smoothly. I had played Gmod successfully 2 or 3 days in a row…but for whatever reason it now spawns me in the air like I’m in noclip. However if I actually press “V” I still just stand there in the air and can’t move. On top of all of that…it’s suddenly decided it wants to lag horribly. I feel like I’ve done EVERYTHING to fix this but nothing has worked. Please help

Maybe if you type kill in console it will reset your location ?
or else try
to Verifying Game Cache Files
If that does not work , remove all your addons and workshop files
If that does not work either , rename your garrysmod folder.