Maybe this is my opinion but i would not take seriously the opinion of a random old man who makes passing judgements about you after one conversation. Confidence in my opinion is mostly a learned skill, like any other skill, rather than an innate quality about you. It takes practice and time and intention, because sometimes the default bc can be to feel unconfident. But someone random on a bus isn’t going to know you well enough to know if you are confident or afraid, they are just passing their unsolicited opinions along