Your brace will often feel tight if it is new or it has just been adjusted. Also, it will feel tight if you have moved to the next aligner/positioner (for those having clear brace treatment).
This is quite normal and after a few days of wear the brace will not feel as tight.
Do not remove the brace in the hope that it will be easier for you. The relief will only be temporary as you will have to start wearing the brace again and the tightness will begin again.
If you feel your brace is too tight to wear, contact the practice for an earlier appointment.