My advice is don't keep asking yourself if you can do something. Just get out there and do it. You can really surprise yourself.
I am a rolling stone, never in one place for very long.
Fall down nine times, get up ten.
I just used to have a really normal life, working in an office.
I have learned to acknowledge and appreciate the 98% that I have achieved instead of the 2% that I didn't.
The bigger the challenge, the bigger the sense of accomplishment when you get to the end of it.