ALWAYS be confident in your decisions. Live life for you. If someone doesn't like it i guess they don't have your best interest in mind. only you can make the decisions that will change your life into what you want it to be.
And it's not easy letting the things that make you sad, go as far back as i can remember the sad things were a big part of my life. Which were very Happy Times but I let go and I do hold on to the positive memories :-D