Why is my screen flickering?

it all started when I downloaded Sims 4 ( which is a game) on Utorrent because it cost too much and after waiting about 4 days It finished downloading and I installed it, played it for about 3 days then I somehow found some weird white lines appear and the screen sometimes was flickering or moving so I blamed it on the game and instantly uninstalled it and all the files it had. But it didn't go away. Until about 1 week or something after, I talked to a relative who used to have one and somehow the day I told her it stopped and the screen became fine again. I spent about a month using my macbook and it was perfect.So I called myself stupid for uninstalling it and reinstalled it again. And on the day I installed it and opened the game I went to get a snack and there it was,again.But now it's flickering much more and the screen is moving so much. I don't know if it's a virus or something with the display i just hope someone takes the time to answer this and also The only apple store near me is in another country which is 100.04 miles / 161 km away from me soo