Sean

You are determinded, and I understand that. I was determined at your age. Pick however you are closest to in you family and show them your hair WITHOUT the paste and concealer. Tell then you you are going to try what you are thinking about trying. If you hair is as thin as you say it is, they will get it. I just feel things will be easier for you if you share this with somebody. Your family may notice a difference when you go from thin hair to a full head of hair and if it makes you feel better, that should not matter. You can do your putting on and taking off in private, that you can keep from them. It's not permanent, and it wont scar you like transplants, you can keep it on or change your mind and go back.
Please let us know what happens.