"Danger is real, fear is a choice".
While I was (really) young, much bigger people could intimidate me, for example while going out. I've found my solution in Krav Maga (together with working out). Due to my job, I work at (big) clubs and (huge aswell as small) events and festivals in my country (and beyond border sometimes), in the security (management) industry. I have to deal with violence quite often. Yet, intimidating does not happen anymore.
Working out and practising Krav Maga often (4-5 times per week and 3 trainings per week) I really become more fearless. However, Krav Maga will learn you not to be a cowboy; there's no need to always fight the fear or the risk; if you can run away to escape from a danger (such as a fight) - do it. Krav Maga however does learn you too how to deal with situations in which you cannot escape anymore. Having such background, you learn 'Semper Vigilans' - always vigilant. Analyze the dangers and risks around you, but not in an extreme - be prepared, not scared.
Great topic!
Edit; made my occupation a bit more vague.