Little confidence-boosting exercise for you:
Write a list of all your achievements, as many as you can remember. Call it your Lifetime Achievements list.
It might include sporting experiences, travel, school accomplishments, dating and relationship milestones, business and career wins... anything and everything that you did well and should be proud of.
Don't diminish or qualify these in any way (i.e. don't say "I went travelling to USA but that was ages ago").
Comment below with your favourite from the list when you're done!