My computer is having a hard time connecting to voice and video game services, but my internet is fine...help?

Pretty much what the title says. I keep getting disconnected trying to play Destiny 2 and Discord is constantly losing connection, but the internet speed test is showing 250mbps down and 10\~12 mbps up, which is the same as it usually is. None of my browsers are having any issues connecting to things like youtube, etc. I'm connected via ethernet cable, OS is windows 10 home. This is a new issue that only started about a week ago, the only changes prior to that were that I allowed my mother to use my computer to take an exam on ProctorU.

I've tried to look it up via google, but have no idea where to even start. I'm not even entirely sure this is a computer issue and not a weird internet issue.

Thanks in advance!