i have a question about predestination (well duh, considering the thread title

)
“For those God foreknew he also predestined to be conformed to the likeness of his Son, that he might be the firstborn among many brothers. And those he predestined, he also called; those he called, he also justified; those he justified, he also glorified.”-Romans 8:29-30.
Ephesians 1:5 and 11. “He predestined us to be adopted as his sons through Jesus Christ, in accordance with his pleasure and will…In him we were also chosen, having been predestined according to the plan of him who works out everything in conformity with the purpose of his will.”
Looking at these verses, it seems that predestination is true. from a personal standpoint, i reject predestination, as it seems to interfere with free will, something i believe in strongly. Now, someone (a Christian please, i don't want atheists, etc., with all due respect to tear this apart) help me interpret this. do these verses mean some are predestined to go to heaven (or whatever the proper term is) and everyone else has a choice, or does it mean the Calvinist predestination idea, that you're going to heaven or hell and you have absolutely no choice in the matter? or does it mean something totally different?
and another thing! if these verses mean that Calvinist predestination is the truth, then what is the point of believing in Christ? If you believe in Christ as Savior, and also believe that if you do God may still tell you to go to hell, doesn't the rest of Scripture fall apart? Believing in Christ alone won't save you if you follow this idea, but doesn't that contradict many a teaching of Jesus? or am i just a total idiot who has no idea what i'm talking about (i'm pretty sure this is true...

)