Not able to play sorta

I log into the minecraft launcher, it logs me in. I click play on any version I want. I join a single-player world and if I chat it says i'm, player, not Rxboi. When I try to join a multiplayer server, it says invalid session, but it doesn't say restart your launcher, and try refreshing. I close the game, and the launcher is closed, and I have to log in even though I have "remember me" on. But that was on labymod. In Optifine or default, It says I am on demo mode.

What I expected to happen was...:
I should be able to play on my account and be able to play multiplayer

What actually happened was...:
I was going to play on a multiplayer server, then it said I had to relaunch my game or try to refresh.

Steps to Reproduce:
1. Open minecraft launcher
2. Choose a version (any)
3. Launch it

4. Join any world or server.