I think you'll do better posting on the "Heart Disease" community...perhaps you have.
I have been on beta blockers for many years, and have not noticed any problem with interest in sex, I think the impact on sex drive is not universal and will also depend on the does level you are taking. Anything 50 mg and under are low does in my opinion. I never had a problem at the 50 mg level.
I think BB may cause some fatigue, but it doesn't affect my mental interest in most of life's physical and mental activities.
You need to talk with your doctor about the level of exercise you can engage in, especially any power lifting, that puts a focused strain on the heart, I understand.
Seems it "runs in the family" and the only thing you can do it take whatever action give you the best chance at ongoing healthy living, your healthy life style should be a help