is some one playing on my account ooooooor...?

i open league of legends, and it goes straight to a game. it says there's a game in progress but wont load, there's an error. i close the league of legends game, but it tells me to reconnect. i'll go and change my password now, but i anyone know why this is happening, if not for other person playing the game?

edit: i tried changing the password, but right now, the code doesn't get sent into my email. i don't want to lose all the money, i've spent so far.