If the above guess is correct, this is normal. If you find this feeling annoying, you can dip a cotton swab in glycerin (a cosmetic to prevent chapped skin on your hands in the store in winter) and gently turn it in the ear canal. Apply oil to the skin surface in the ear canal every day, and the rustling should be reduced or disappeared. Applying oil to the ear canal often helps to soften earwax and inhibit hair growth.
For reference only.