I advise you not to hide your feelings, do not pretend that you are fine when you are not fine, do not pretend to be happy when you are sad, this will only lead to your suffering. People always leave. Don't get too attached. Some people just don't deserve you. They are not ready for your level of devotion or love. You have to remember that not everyone was raised like you. Not everyone has a pure heart or good intentions like you. And not everyone has your best interests at heart and wants you to succeed. Follow your dreams and know that even if you fail, guardian angels are watching over you every day.