Character does't move and it is the wrong one.

Hey, I am new to programming and have no experience. I wanted to make a kind of parcour game for fun and to learn a bit. I watched some tutorials on youtube, like how to make a main menu, a settings menu and a pause menu. The main menu and the settings menu work, but the pause menu didn’t work because when I tried to start the game, the wrong character was there and I couldn’t move and also instead of being in the main menu, which was at the very beginning of the game the times before, I was right in the game.
Can anyone help?