Whether you blew it out of proportion or not, you had a really scary experience and you do deserve to have the reaction that's natural. I hope you can openly discuss this with your therapist. Maybe the guy is scary, or maybe you're feeling really scared right now, but either is worth looking at. I applaud you for listening to your instincts. And your urge was to get away and not do something stupid or aggressive so what's it to anyone else? I'd probably do the same and then go home and be embarrassed for no reason.