~ I have half an hour another country and the same thing happened to me as to you, I saw and entered the casinos, I saw how people moved their money, and they gambled large sums, actually I was embarrassed to bet very little with respect to them, I didn't want to be the one to make them laugh at them, and so I refrained because I really didn't think I was at their level even to be able to play, I don't know, I think I felt a little bad, maybe intimidated.
Interesting experience. I think it's good that you didn't try to "be on their level" and bet big amounts in order to get their respect. I actually can relate to your story. I'm almost always betting very small money, like $0.10 or $0.20, and sometimes I have exactly this feeling of embarrassment you mentioned, when I post about me winning $15 with 150x of my bet win, while other people would bet $10 instead of 10 cents, and win $1,500 with the same luck. But I try to banish feeling of embarrassment because I know, there's no shame in not being rich.
There is no point on trying to compare ourselves with other people because there is always going to be someone that can use way more money than what we can use, what we must care about is how much money we can dedicate to our gambling hobby and never going above that amount, if you can do that then you are fine, besides you have no way to know what it is behind the people which are making those huge bets as unlike you they may be addicted to gambling and they could be the ones jealous of you by being able to get fun while using so little money.