Be brave enough to say no

What do I mean? I mean if you know you can't do something or arenʼt ready to do something you can just say ʼnoʼ or just simply walk away. An example of this is I am really scared of riding a bike and today my family was going to go on a bike ride on a road and I just couldn't ride. So I just said no and walked away. It wasn't easy but there was no way I was riding. All I'm just trying to say is you can always say "no" and walk away. It's not always easy but remember in the end, this is your life so you choose how to live it.