not be alone in (doing) something
From Longman Dictionary of Contemporary Englishnot be alone in (doing) somethingnot be alone in (doing) somethingONLYto not be the only person to do something You’re not alone in feeling upset, believe me. → aloneExamples from the Corpusnot be alone in (doing) something• But this market has not yet developed, and when it does Pippin will not be alone in it.