And you aren't?
That is why we preach and teach the Word.
Why? What's the use if everyone is already "predestined"?
Not only is that a false dichotomy, it defies logic.
Suffice to say, it's a very complex issue that neither one of us has done justice in explaining, though perhaps we've scratched the surface some. :)
There are two vantage points to look at this: God’s and ours.
From God’s omniscient point of view, he know exactly who will call on Him, and in His omnipotent power, has arranged all thing to work for His elect’s good (Romans 8). He will lose none that He has called. This is what Paul is teaching in Romans 8 and 9.
From our point of view, we come to faith by hearing His word, and being renewed by the Holy Spirit. We do not find ourselves kicking and screaming to come into His Kingdom, but rejoice in it. This is application presented in Romans 10.
Now, by nature, sinful man by nature is not inclined towards God, and must be given a new nature, replacing the heart of stone for a heart of flesh (Ezekiel 11:19, 36:26).
So, my question to you is: Who changes our nature, that we would follow God and not rebel against him?