Dear Time Traveler, we've been expecting you.
It seems you're here for help with predestination problems. That's quite a specific concern.
Let us put on our thinking caps, or rather, our predestinated thinking caps, and try to help.
Here's a Temporal Loopholes page that might shed some light on your predicament.
Or, if that's not your cup of tea, we have ChronoConundrums to consider.
If all else fails, you can try Paradoxical Pitfalls to get your head spinning.