It is God's calling or just my desire...?

feeling weird while chatting wif a fren named Terry about the vocation camp.. it just like wanna join the camp... however the camp is for full time worker in church.... the problem is now i studying at uni now.. until half le.. really God calling to serve Him..? do anyone can tell me what should i do now...? which way do i walk...? how can i make my choices....? feel so blur now..... very confuse.... oledy got one prob haven't solve yet, then comes another... T.T....