I let my 7 year old niece put her head close to mine and she heard the noises my brain was making.
If your 7 year old niece was able to hear your noises, then it's called objective tinnitus, and likely not generated by your brain.
Have you gotten it checked by specialists? (they should also be able to hear it if your 7 year old niece hears it, especially if they use special amplification instruments)