I completely agree with Jongeth_ here. Fully draining your battery will have repercussions on the longevity of your battery life in the long run.
There are many factors on why the battery drains so fast. It might be because your battery isn't optimized well so you must be running too many background apps along with your gaming apps. Aside from this, your gaming apps can also contribute to your battery health. The more advanced the graphics in your games are, the harder the chipsets will work. This cycle will have a grave effect on your battery life in the long run.
I suggest optimizing your battery and putting background apps that you don't usually use into sleep because this will be a great help in prolonging your battery life. You can read this article for more information about battery optimization: https://www.samsung.com/ph/support/galaxy-battery/optimization/