Decisions and faith

When I think about all of the decisions I've made (and Luther and I have made together) in the past couple years, I know that God has had a part of all decisions and that he has given us the knowledge to make good decisions. We decided to get married, buy a house, send me back to school (two times), etc. These are pretty life-altering decisions. Now I feel like there's another decision to be made and I'm struggling to decipher what God is saying versus what my own desire is saying.

Our church has worked with a community called Grips Farm in Zambia for the last few years. Many amazing things have occurred since the church became involved and ever since we started attending the church, I have had a little desire to go to Zambia and see first hand the work that God is doing. Anyone who knows me would understand how odd this is to be coming from me...I am not a big fan of being uncomfortable and I hate getting dirty. I'm more fond of traveling to places like NYC, Paris, Greece, the beach.... However, I can't deny that I have this yearning to go and be with these children first hand and love them the way that Christ loves us. The problem comes in because I can't tell if this desire is something that God has placed on my heart or if it is coming from my own desire for adventure. I am really praying for a sign confirming that God would want me to be with this team that is going to Zambia in the summer but I am struggling with having enough faith to believe that the money will be provided if I am supposed to go. We definitely do not have $3,000 to spend on a trip...and that is my predicament.
I am praying that God will show us if I am supposed to be on this trip and if so, that the money will be provided. I know that God does amazing things and that He can provide for all of our needs.

Psalm 37:4 Delight yourself in the LORD; And He will give you the desires of your heart.