A lot may depend on where you are recording. A microphones job is to pick up sounds. If you are recording in a room with a lot of things going on then that will show in the recording. Recording in a home you can will pick up appliances like a TV or dish washer in another room, or cars driving by, and maybe dogs barking outside. All of those things will add to the room noise where you are recording. If you are in an apartment building those are bigger because of the connections to other spaces. Also, room acoustics will make a difference. If you go into an empty garage for a car. A square room with a concrete floor and use that to record, it's going to be loud. All of the sound will bounce off of the walls and floor back into the mic. Go into different rooms and clap, then listen to how it echoes. In a bedroom you'll have a little echo, a bathroom there's more, and empty garage, there's a lot more. If you have no acoustic treatment then that can cause you noise. Professional studios have isolated rooms that are set up to have no noise, and thus the mic only pics up the voice.
Without actually hearing the sound, and knowing more about the room you are recording, it's hard to say the problem. There could even be problems with the set-up or use of your gear.
If you are recording at home in a bedroom or something, try moving the mic into the closet. I've gotten great results in a walk-in closet with clothes lining the sides. The room you use also turns into its own instrument at times. More often in recording drums, but the principle is the same. I had a session a few months ago where I went to a bands practice space to record them. It was a big garage. They wanted to do some vocals, but didn't want to leave the garage. I took some clamps and blankets and built a small box to put the mic in and let the singer sing. Was it perfect? No, but it sounded good for what it was.
Good luck
