People say things about us all the time. They are just words, but we take them to heart and believe them. In 2 Samuel, Mephibosheth was called a cripple (i.e. useless) and so saw himself as useless too.
If we allow ourselves to be defined by these lies, we forget our true value. How silly is that? Letting others control us when they don’t really know us.
Don’t let what others say change you. Be defined by HIM who knows you best. And HE says you are loved, adopted, valuable, chosen. So stand up tall and fulfil your destiny.