macbook pro overheating

i have a 15 inch macbook pro

latest version of mojave (mid 2018 version)

2.2 GHz Core i7

16 GB DDR4

Radeon Pro 555X

I just watch one 720p youtube video with no other windows or apps open, just the video and it heats up to the temperature of when I'm playing a graphically intensive game. I have restarted my laptop as well as resetting the NVRAM multiple times but it does not work, taking it to the apple store takes too long and I need this laptop for school work. Any tips?

My SSD is quite full with an almost full boot camp partition, is that the problem?