“Don’t be alarmed,” he said. “You are looking for Jesus the Nazarene, who was crucified. He has risen! He is not here. See the place where they laid him. But go, tell his disciples and Peter, ‘He is going ahead of you into Galilee. There you will see him, just as he told you.’”
Notice Peter is specifically called out separately from the disciples. He must have felt overwhelming grief for denying Jesus and no longer considered himself a disciple. May I remember God forgives me, even though I am not and do not feel worthy of His forgiveness.