I am not able to wear retainers. is there any alternative of it? because whenever i put retainers i don't feel well

Retainers: There are alternatives, such as clear trays that snap over your teeth or wires bonded to the tongue side of your teeth. Every retainer has different advantages and disadvantages. If you have been seeing qualified Orthodontic Specialist ask him/her to discuss the alternatives with you. The one thing I can tell you is that retainers are not worn exactly as directed, teeth will shift.