It depends on the family history of sudden death, size of the septum, presence of obstruction and or presence or dysfunction in the subvalvular apparatus. All of these are complex issues, but there is no reason to think that you should not have a long a fruitful life ahead of you if you follow your doctor's advise. Initially this may include taking some medications, but may also include the placement of a defibrillator and avoidance of contact sports.
Found this inof. Don't give up.
In all patients with hypertrophic cardiomyopathy risk stratification is essential to attempt to ascertain which patients are at risk for sudden cardiac death. In those patients deemed to be at high risk the benefits and infrequent complications of defibrillator therapy are discussed; devices have been implanted in as many as 15% of patients at HCM centers. Treatment of symptoms of obstructive HCM is directed towards decreasing the left ventricular outflow tract gradient and symptoms of dyspnea, chest pain and syncope. Medical therapy is successful in the majority of patients. The first medication that is routinely used is a beta-blocker (metoprolol, atenolol, bisoprolol, propranolol).
You could live a normal lifespan or even longer depending on the degree of your HCM and symptoms.