Welcome to HCM
We understand your concerns
I went through your problem description. You are just 20 and you should concentrate on your career rather than on your body and host of illnesses. Please don't worry.
If you have these worries, do visit a physician and clarify your doubts. Once the medical science says that you are perfectly fit, then forget your doubts and learn to enjoy life. Unnecessary thinking creates anxiety
Hope this answers your query partially. Available for further clarification.