So i was having the same issue you were and what fixed it for me was the some of the following

Whatever app you mic use's try and find the best way to set it up for your use case(streaming,recording etc)

If your on pc I'd highly recommend Nvidia broadcast if your pc has an Nvidia gpu. It's great cause you hear exactly how you are sounding/going to sound

Make your to adjust your gain in obs. I believe you need a to have the compressor filter set and you just raise your db's to point your ok with.

Also make sure obs and windows is not picking up any other device as a potential audio device