1. I can't do it
If you're not brave enough then yes you can't take the right steps. But if you take the right steps then there is nothing you can't do. The important point is to avoid our brain lying to us.
2. Others are better than me
If you believe in your brain then you will never feel fine.
3. I don't have time
You think that you don't have time but then you realize that indeed you have- for the things that you really want to do.
4. I can do it later
There is no time like the present.
5. No harm in just a one-off thing
If you give up on something then don't do it again.
6. It's too late
It's one of the most common excuses. No! It's never too late for anything. You can try new ways.