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well more the....I am entirely yeahh, but the mind sometimes thinks.. 'are you sure? should you really? what are you getting yourself into??'

and then that nehhhhh feeling comes lurking around the corner again. Maybe its a girl thing ;)

Not really . It's internal dialogue. Everybody has it. Most of the times it is trying to protect you, from the unknown for example.
Just like when your mum told you "be careful when you cross the street" . You said all right and crossed the street.