Hey, i was diagnosed with a severe acl tear, so my question here, why can't i perform a surgery as am an athlete and will i be able to play without it?

Acl tear: If you are an athlete you should seriously consider having surgery for your acl tear. You risk further injury and tearing your meniscus if you do not have it done.

Yes you should: When you tear an acl, a person often feels as though the knee went the wrong way. It is usually a non-contact injury. The knee will swell. Later after recovery from the pain and swelling of this first injury, the knee often feels great. The symptoms then are of recurring instability like you don't trust the knee or it gives out. So the symptoms actually change with time. Surgery is usually the tx.