Hey Azrath!
To be honest, your cam is pretty bad. I recommend you buying a 720p/1080p 60FPS cam (Those are on the expensive side, unfortunately) . Second I'd recommend you using a good/decent gaming recording software, for example: Fraps, OBS, Dxtory. Try setting the FPS of those to 30-60. If you have a bad PC, I woudn't recommend you (nor anyone) to start a YouTube gaming channel. Cause at the end it will be laggy, the quality will be bad, and you just will get haters. Third thing I noticed is the size of Minecraft is not fitting on the screen. Try fitting it on the screen! Use 1280x720 or 1920x1080 resolution to let it fit perfectly on the screen (or more ofcourse). Now the light, I recommend you putting light in front of your face, so its better to actually see your face. The light in your room is above you.. thats not good (even tho you have some light coming from your monitor to your face, which isnt bad). The quality isn't the best either. Now the actual good microphones are on the expensive side too, but if you really wanna do YouTube good you should really consider buying a better microphone/headset (a stereo microphone would be the best)
Important to-do's:
1. Buy a better cam, a 720p/1080p 60FPS cam.
2. Download a better recording software
3. Change Minecraft resolution
4. Put light infront of your face
5. Buy a better (stereo) microphone/headset
Hope I helped you! If you any need more help, pm me and I will give you my Skype! Good luck!