Don’t let it worry you. Dr found a heart murmur in my heart about 10 years ago. We just watched it, no longer present. Whatever was causing it healed.
Just take it easy and don’t let the Dr panic you into something,
This is common.
I hope your doctor gave you some good information.
Please don't worry about it.
Worst case scenario is a valve replacement.
Not a bed of roses, but fixable.
My dad had his replaced 2 years ago and felt better than he had in years.
He was tired all the time.
The operation made him a new man.