Hi there and welcome. Yes, try to do as the above poster describes. Try to relax. With time, this should get better as the vagina is made to stretch. We have babies through that canal. :>) good luck
Try lots of foreplay
Some times this helps relax the vaginal walls
Make sure there is enough lubrication if not use a lubricant
If it's painful I would see a dr it can be a type of muscle spasm