Some lower teeth are receeding because i havent been brushing my teeth frequently , if i do so , will it stop?

Recession: I assume you mean gum recession. You're too young to have this happen. Probably duet gum disease. May also be due to malposition of teeth. You have to start with a professional cleaning both above and below the gum line. Then hour dentist/Hygienist can teach you proper oral hygiene techniques. Please see a local Dentist now to help you back togged oral health status.

Gum recession : For starters, do start brushing 2x/day for 2 minutes with a soft or electric brush and floss at night before you sleep. However, if you haven’t seen a dentist for over 6 months, you are due for a visit to check the reason for the recession. In addition to home care, a professional cleaning may also help prevent additional gum recession.