Hi there!
Great that you feel called to be a missionary! But even if you weren't directly called, God sends all of us to the mission field
.
Last year I went with Youth With A Mission to China during the Olympic Games. I too was scared that it was going to be more of a vacation, but those fears didn't come true. We spent just over two weeks in Beijing and we went to lots of sightseeing places, but while we were there God used us in wonderful ways, even to witness to crowds of hundreds of people at a time. Every person we met was a new oppertunity to share some of Christ's love... in the bus, in the subway, in Mc Donalds etc etc. Just think of it this way... you're not only going there to share your faith with others, you're also going there to learn. From personal experience, the Chinese people we met were really happy when they found out we were interested in their culture, and it led us to have really good conversations. God can use you anywhere, so you don't have to worry at all that it will be a vacation. And anyway, these short trips can be very emotional, and physically challenging because you are constantly on the go. Some free time wouldn't hurt just to digest all the amazing things you've seen God doing
.
Oh and about the costs: it's a lot of money, that's true. But if God wants you to go, He will surely provide. The money you recieve won't be yours anyway, but God's. It's His money He is investing into you, so that you can double it in other ways
.
Anyway, I hope you will go! I can say that the time I spent in China changed me and my faith became much stronger... and I can tell you the same will happen to you
. See these short trips as starting missionary trips, and perhaps God will lead you to more full-time oppertunities. But don't consider these trips of any lesser worth. God can do so much with so little time
.
(Hah, this year I will be going to Moldova for two weeks... I don't nearly have all the money needed... but I know that God will provide before the deadline in 3 months
. Praise Jesus!)
God bless and good luck!