At the start of my career the biggest problem for me was my temper. As you probably already know with a temper; tilting will most likely come as a bonus.
You can, with pretty simple means, counteract this evil phenomenon. One short but effective advice would be to do something else as soon as you feel that your game is affected in a negative way. However I want to point out that it might be - pretty simple means - but you have to be consistent and it might take some time to erase those bad habits.
You can read more on this topic below.