What should i do about this?

Ok so I feel God calling me to go on this missions trip to east Asia next summer. The trip will be 3 weeks and it costs 4000 dollars ........ My church will be supportive cause that's just the kind of people they are but I haven't told my church yet. but I have told my parents but my dad doesn't seem to be very supportive about my doing this.... Going on missions trips aren't something new to me or him cause last summer I went to london england. My dad and I are very close and his opinions and thoughts about what I do and don't do are very important to me but it hurt me that he doesn't seem on board with all of this....and he's a preacher the preacher of my church.....what he thinks will make a big difference on how I the church reacts to this....because of his influence and all. But I really do feel God calling me to do this btw I'm 17 in 2 days so I'm still a kid so ultimately I'm still under my parents....you know.....so what should I do? About my dad and what he thinks? I mean he hasn't said no but he hasn't said yes or shown any happiness or excitement for me its very weird for my dad to act like that cause he's always very supportive of me and like I said were very close.