The doctor said i had a heart murmur but it is mild is that okay?

Usually: A murmur is just an abnormal sound the heart makes, usually from one of the 4 valves. The vast majority are of no clinical significance. But the type and quality of murmur help to determine if it's a problem. Especially if you are not having any symptoms (fatigue, dizziness, etc) a mild murmur is benign.

Echocardiogram: Many heart murmurs are insignificant and the examining physician usually can identify significant ones. If there is any doubt, an echocardiogram can diagnose abnormalities of the heart which produce heart murmurs. If the echocardiogram is normal it proves that a murmur is insignificant.