Your plans will change dramatically. Be prepared. Wear comfortable shoes.
One of the quickest ways to silence that negative voice in your mind that tells you that you can't is to go ahead and do it anyway. If it says that you can't sing, then singing will silence it. If it says that you can't dance, then dance. If it tells you to stop trying, try anyway. You'll soon begin to realise that the voice isn't reality, it's just a voice and it can only stop you if you give it power.
If someone asks for your opinion, that's fine. But start with facts first, and then explain that your opinion is based on these.