Bahareh, I have to agree with the rest of the posts below. Interest rates are still very low, and depending on your financial situation, buying can be much cheaper than renting, especially if you plan on staying in the place for 8-10 years. It doesn't sound like your friends are in the real estate business, which tends to lead to bad advice. Would you listen to your doctor about legal advice?
Going off the basic principal of buy low, sell high, why would you wait until prices have appreciated to purchase a home? My advice would be to talk to a real estate professional about your goals and they can help you determine what would work best for you.
Long and Foster