Another thing you can do is buy a mic shield that wraps acoustic foam around it.
Use a noise gate filter, like I linked above. There are plenty of YouTube tutorials that can show you the step by step process of setting it up.http://vocaroo.com/i/s0uaqK4PBF47 this is link from record please check this.I have background sound when I don't speak.
That's just a case of sound getting to your microphone. Now you're into recording production territory. Look up how voice actors and radio technicians set up their microphones. Since you can't use software to extract your voice, you have to isolate your recording as much as possible.Now the problem is when I speak :(( I looked on Youtube and I don't find best settings....