I am 20 and I've been recovered from the virus myocarditis 4 years ago, but I can't regain my power(I can't do anything for long time because I am easy to feel tired). I used to play football after I recovered, but things gets worse, I feel tired so I dare not do any extreme sports anymore, even running. My condition is getting weaker although my doctor told I was okay to do anything. My friends tell me "It is not ok if you are that weak", I am afriad of not having a girlfriend in the future. I got frustrated about that.

I am a newcomer, so could anybody give me a plan on sports(as detail as possible)? I wanna improve my condition without feeling that tired. Or could anybody list some related information(website, news)

Thx.

Mr Frustrated.