I have a fast resting heart rate and low blood pressure. Does this mean my heart is not efficient? Could I have heart trouble valve or myopathy?

Depends on symptoms. To answer your question, a cardiologist would want to know more details about your history, your symptoms (especially including exercise tolerance) and might order some tests.
? POTS. Although there is very little other information, you could possibly have paroxysmal orthostatic tachycardia syndrome. The increase in heart rate would in particular occur upon standing. This can be accompanied by associated decrease in blood pressure - with lightheadedness, fatigue, excessive thirst. If chronic, can prompt cold extremities, shortness of breath, headache, restless sleep, GI symptom.