For those that God has predestined to save, yes it's good to be part of the group. But what about for those He has not chosen? What if we believe and want to be saved, only to find God hasn't chosen us?
We can certainly sympathize with your doubts over the Bible's teaching on predestination because most Christians share your experience as they wrestle with this difficult concept for the first time. Your concerns center on the prospect of a person who wants to be saved but is prevented by God's failure to choose them, but the scenario you proposed is impossible, according to Scripture.
According to the Bible's teaching, there is no such thing as a person who "wants" to be saved but can't because God hasn't chosen that person. On the contrary, the Bible states plainly that no one (apart from God's grace) ever wants to be saved:
No one seeks God on his own. The human condition from birth is set opposed to God and is an enemy of God, and there is no way in human terms that a person will ever overcome that nature and seek to be saved by Jesus.
And the Bible also teaches that the call of the Gospel is foolishness to those who have not been elected by God to hear it:
Only those called by God (i.e., predestined) are able to hear and understand the Gospel so as to respond affirmatively. For everyone else, the Gospel is foolishness, the Bible says. God did not "prevent" someone from hearing the Gospel, because everyone is born unable to hear and respond already. Unbelief is the natural condition of all mankind from birth, so only the power of God (see 1 Corinthians 1:24) brings a person to saving faith. The Bible calls this moment being "born again", so we must be born again by God or else we would never believe. As Paul says:
Our ministry features a very helpful two-part article that addresses your concerns in much greater detail. We highly recommend you read it. You can find it here: Wrestling with God
Finally, we strongly encourage you to listen to the counsel of Scripture in our Romans study so you can fully grasp the meaning of predestination and the inevitable necessity of it given man's fallen nature and opposition to God. The doctrine is difficult, but it is also one of the most glorious truths of the Bible, because it amplifies the mercy and love of God knowing that He acted on our behalf while we were still His enemy: