Mom troubles

So I tore my ACL last year and I’m still healing from my surgery. I’m an athlete and all I wanna do is get back to sports. My mom keeps doubting me when I say that I’m gonna get back before the end of my season and it hurts me a lot. She says that I’m not being realistic. I try to act confident and say that I’ll be able to do it, but what my mom says keeps tearing me down. Tearing my ACL has hurt me so much and I’ve been so sad and crying all the time and I don’t know what to do. What should I do???