What happens if my friends keep asking me questions about where my journal is?

If you want to keep the journal for yourself, don't show it to them no matter what. First thing you can do is to avoid the topic and make them forget about the journal. When this doesn't work and they keep asking, confront them openly. Stand up for yourself and make it clear that it is your personal thing, and they have no right to want it from you. If you see that the situation requires it, tell them something general about the journal (like "I write about my day to relieve stress throught it"). Maybe they would become less curious; however, be kind, patient and stand up for yourself