As you said your teeth position is changing, it looks because of your wisdom tooth eruption (also your age proving that reason)
Take full mouth x-ray called OPG,
Next Steps
visit your nearby dentist, he/she will decide treatment line by seeing OPG , if wisdom tooth involved take proper decision according to their position in mouth (one or more may require removal),
Health Tips
if wisdom tooth not reason go for braces by orthodontist