I think that it is more about setting limits and compartmentalizing your life. You give money for a service of some kind. They aren’t seeing you for free.
Also, in your home country, I don’t think that you would socialize with guys that you are paying. The paid guys and your regular friends would probably be two social circles that do not mix. Since you are now living in Thailand, even if only part of the year, I would treat it similar to how you would have behaved in your home country. I have not been to Pattaya, yet. However, I think that living away from the scene would be a better idea than living too close. That way, you don’t have to walk past the massage shops and bars when doing your daily errands.
It isn’t about being bitter or jaded. Just be clear in your own mind that you don’t give money away for free. That is just the way it is. No need to get angry or worked up or guilty or anxious, etc. That is just the way that it is.