I can't enter a server,in the mctier server to verify

I }{}can't enter into a server, it says "you are not logged into your minecraft account" I've been having this problem for a long time, please I need help, I get too stressed out I can't get into the server, and I'm actually in my minecraft account, I don't understand, please help, if you need my email i drop it
My minecraft user is iSagesito, PLEASE MOJANG, HELP ME
no puedo entrar a un servidor que me sirve bastante, el minecraft detecta que no estoy en mi cuenta, si lo estoy, ayuda