Consider the opinion held by some biblical scholars that this rich man who encounters Jesus and goes away "sad" doesn't necessarily stay away from Him. He remembers Jesus's "look of love" and eventually does become a disciple. In fact, he may be Saint Mark the Evangelist himself, the author of this Gospel, the only one of the evangelists who mentions in this story that "Jesus, looking at him, loved him."
God loves us, and all things are possible to Him. Never give up hope. Trust in Jesus, always.
"As Jesus was setting out on a journey, a man ran up, knelt down before him, and asked him, 'Good teacher, what must I do to inherit eternal life?' Jesus answered him, 'Why do you call me good? No one is good but God alone. You know the commandments: You shall not kill; you shall not commit adultery; you shall not steal; you shall not bear false witness; you shall not defraud; honor your father and your mother.'
"He replied and said to him, 'Teacher, all of these I have observed from my youth.'
"Jesus, looking at him, loved him and said to him, 'You are lacking in one thing. Go, sell what you have, and give to the poor and you will have treasure in heaven; then come, follow me.' At that statement his face fell, and he went away sad, for he had many possessions.
"Jesus looked around and said to his disciples, 'How hard it is for those who have wealth to enter the kingdom of God!' The disciples were amazed at his words. So Jesus again said to them in reply, 'Children, how hard it is to enter the kingdom of God! It is easier for a camel to pass through the eye of a needle than for one who is rich to enter the kingdom of God.'
"They were exceedingly astonished and said among themselves, 'Then who can be saved?' Jesus looked at them and said, 'For human beings it is impossible, but not for God. All things are possible for God.'"
~Mark 10:17-27
"As Jesus was setting out on a journey, a man ran up, knelt down before him, and asked him, 'Good teacher, what must I do to inherit eternal life?' Jesus answered him, 'Why do you call me good? No one is good but God alone. You know the commandments: You shall not kill; you shall not commit adultery; you shall not steal; you shall not bear false witness; you shall not defraud; honor your father and your mother.'
"He replied and said to him, 'Teacher, all of these I have observed from my youth.'
"Jesus, looking at him, loved him and said to him, 'You are lacking in one thing. Go, sell what you have, and give to the poor and you will have treasure in heaven; then come, follow me.' At that statement his face fell, and he went away sad, for he had many possessions.
"Jesus looked around and said to his disciples, 'How hard it is for those who have wealth to enter the kingdom of God!' The disciples were amazed at his words. So Jesus again said to them in reply, 'Children, how hard it is to enter the kingdom of God! It is easier for a camel to pass through the eye of a needle than for one who is rich to enter the kingdom of God.'
"They were exceedingly astonished and said among themselves, 'Then who can be saved?' Jesus looked at them and said, 'For human beings it is impossible, but not for God. All things are possible for God.'"
~Mark 10:17-27