Yes it could be normal, if this has been long standing,,,not necessarily both of your tonsils should be symmetrically equal in size and bulk tissue. It could be anatomical variation,, but yes if you have pain,,, or if you notice the tonsil to grow bigger or if you noticed this change in recent or tonsil causing you any discomfort or change in colour or texture, then please get your throat evaluated
Next Steps
I would want to know since how long have you been noticing this change???
but besides, please relax, don't overthink, but also keep checking the size to make sure that it's just an anatomical variation and not a disease as such
Health Tips
maintain good oral hygiene