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I was always a very happy, optimistic person.

No matter what, I've always been an optimistic person.

I'm a very upbeat, positive, optimistic type of person.

I was always rather outspoken. I worried about what people thought of me but there really wasn't room for a lot of self-doubt.

I think that I am a deeply optimistic person.

I was a very outgoing, gregarious, full-of-energy kid.

I've always been an optimistic guy, to tell you the truth.

I'm an optimistic person.

I'm a generally optimistic person.

Whereas in the past optimism had been regarded as rather shallow - because 'oh well, it's just your temperament, you happen to be just a cheerful sort of person' - what I wanted to do was to establish that in fact it is the pessimists who are allowing all kinds of errors to creep into their work.