Tug of War

I feel like I am playing tug of war with God...Here are my questions for the day...
Do I feel like this is a good choice for me? Yes, and No. Do I know what God has in store for me if I don't choose it? NO. Do I need to somewhat blindly trust that this is in God's will, and He will get me through school, no matter what my fears are? Yes. Do I have too many fears of failure from my past experiences of difficulty in school? Yes. My answer's are "yes" to all these questions, besides not knowing that I might miss something from God if I say No.
Do I say No to this year's missions trip? Do I say No to further education? Should I just say No to everything right now and ease my mind of all confusion? Do I need to say Yes to God in one or both of these decisions?
Is Satan on to me of bogging my mind down with all these thoughts. Are there spies out there trying to figure out what all these blog posts mean...Maybe I'm the spy, who really doesn't know and wants to know.
Yes, I am feeling more than overwhelmed and need your prayer support. The prayer support that you intercede with someone on their requests and see how you can give glory to God and watch God work in their life.