How to reduce stress heart rate?

In stressful situations, especially when dealing with people, my heart rate rises above 100/minute. My normal resting heart rate is around 60/minute. I tried taking the beta-blocker Bisoprolol at a low dose of 2.5 mg, but it caused my resting heart rate to drop too low, below 50/minute, and I felt weak.

Do you have any suggestions or personal experiences?