You're right, the feeling of how stupid you were is what gets on you.
I've been in a similar situation, this time it wasn't an imposter, it was a fake group on telegram with as much member as the original group. I was added to the group and immediately messages started pumping in. In the original group, we were waiting for their token launch to buy at cheaper rate as there was no presale but here on the fake group, token have launched and purchase was going on speedily with a countdown clock. I immediately rushed in, without verifying where I was I made some purchase with that feeling that I've made the best decision in my life. After about 10 mins I haven't gotten my token, I was worried. I went to the group and saw that the timer has restarted. Wtf!! It dawned on me I've been scammed, I was sweating profusely, the I checked the group and behold it was a fake group, my eyes paused, my stomach churned, it was like I froze. I went to the original group and saw that everywhere was calm, the normal peaceful conversations was going on. OMG, how could I ,I should have known better, I'm not a novice.. I wished I was someone else different from myself, I would have crucified me.
Crypto scams are much out there..we need to double check and check again because in a twinkle of an eye you can loose your life saving