Says that the game is already running

Tried checking Task Manager and ending all java tasks?
Updated Java?
Tried repairing from the .msi (or other, depending on device)?

Does MCL-12634 describe your issue?

Yes, it does, but I have had Minecraft for over a year now and have played many times.

I forward-resolved it as a duplicate of this instead

so is their a way to fix this or not 

this happend to me and they reply with this is a duplicate or smth

is there a way to fix it?

I had a similar issue in the past when a particular mod that is famous for its instability caused a crash, it would make it so that the launcher and windows thought it was still running, and I could not even edit files in the directory. It could be solved by hard-resetting your computer, as when you thought you shut the computer down, Windows actually goes to sleep (even if you tell it to "shut down") and keeps Minecraft in its RAM, so try holding down your power button, unplugging and replugging it (if it is a desktop), or entering this command: "shutdown /s /t 000" into the command prompt or 'run' window that appears when you press Windows+R

i have the same problem but only on all the 1.8.9 versions like vanilla 1.8.9 then forge and optifine its really annoying

happens to me too, I reinstalled it then it worked for a day then went back to normal

hello, it won't let me play on multiplayer servers, can you help me, send me to minecraft.net

Hola me gustaría que me pudieran apoyar con un problema de mi juego minecraft estoy desde un dispositivo móvil, mi problema es que trato de entrar a los servidores pero no me lo permite y ya estoy registrado en el juego se lo pido de la manera mas corsial que me apoye con este problema si quieren les digo como me llamo en el juego pero en privado por favor y muchas gracias espero que pronto me pongan en contexto del problema

i uploaded my log and its the same issue

Forward resolving to MCL-13519 as it contains more info