Look at your piano and say "my dear friend, I love you!"
Look at your favourite sheet music and say "dear friend, I love you".
Why do you play the piano, really? Because you love it, right? Keep on focusing on this. You have the music inside you now, you have learnt to play this piece and that piece and nobody can take that away from you. What other people say about your playing now will always come in second hand.
People will come and go in your life. Relations will come and go. You will get jobs, lose jobs, make a career in this way or that way, you will be judged, you will pass a test or fail a test. Someone you like will tell you that he/she does not like you and think you are no good.
But your favourite composer (Chopin or whoever it might be) will never leave you. Your piano will remain your faithful companion.
I have a beautiful and very, very sweet dog. He is the kindest creature on earth. He loves me unconditionally, he is my best friend. People often give me compliments because they also think he is lovely.
And he has a good pedigree too, so I've been to some dog shows with him. Sometimes he did well, but most of the times he was dismissed by the judge. "Too big". Or whatever. Do you think I would ever change my mind of my dog because he did not get 1st quality prize in a stupid dog show? I still go home with the most beautiful dog in the world, I don't let a stupid old judge decide how proud I should be of him.
And you must not let some strangers, may they be judges or experts or whatever, decide how much you should love playing the piano. If you are a "failure" or not. Look at all the great pianists in the world who never went to that music school of yours, maybe no music school at all. They made it big anyway. Look at all the great authors who got their manuscripts rejected, or did not make it to the Prestigious University Degree because some dusty old professor did not think they had talent. Remember that whenever you play, there will always be someone who does not like you interpretation, who writes an unfair review or simply dismiss you with a shrug: "not very impressing!"
So, from now on, focus on what really matters.