Either they are jealous and you need new friends or maybe you are not humble about your blessings and need to tone it down.

They are most likely jealous of you, you probably just need some new friends, a true friend won't put you down like that. +5

Jealousy. +5

They're jealous of you and all of your greatness.

I'm not so sure it's other people. People probably put you down when you are doing well, when you aren't, all the time--it's human nature. Sometimes things you perceive as put downs aren't, sometimes things you don't perceive as put downs are. I'm not saying that people aren't putting you down when you're doing well for yourself. But that there's a sudden barrage of it then, and only then, or that it only bothers you then, that seems odd. Either you become more sensitive, notice things differently, and there are lots of reasons for that, OR you start acting differently when you're doing well for yourself, causing people to put you down more. Let's take the second scenario. If when you get a promotion you tell everyone you know multiple times and then ask if they've gotten that _____ whatever they've been working towards yet, and you know they haven't, and start giving them condescending advice, people who don't normally put you down, or insult you, might start to change their behavior. They'd feel insulted, put down, frustrated and they'd be heavily inclined to make you feel the same way. If you act like that in front of a group of people, the response is likely for them to band together against you, to make little jokes about you that are mean and not necessarily funny, but everyone laughs, so you, who may feel hurt are pressured to pretend it's funny and not an insult at all. Now if you don't change your behavior and there isn't some other largely compelling reason for everyone else to change their behavior, then, you're probably interpreting the same behavior that goes on around normally differently. Most likely, when you are doing "really well for yourself," you're insecure, about SOMETHING. Maybe it's what you're doing really well at, or maybe you aren't doing so well in some other aspect of your life. You might not even notice, because to you, all the things you think about and count, you've got them all, whatever is important to you. Your job is great, your relationship/family is great, you look great, your healthy, and so you think everything is perfect. But maybe you aren't as happy as you thought. Maybe you're ignoring that while you're happy with you're job, you're not happy with your relationship or family. Maybe you're ignoring that while everything looks perfect on paper, you're excelling at a life you don't want--you're great at your job, but it isn't what you want to do, this isn't the life you imagine living. Or maybe you get scared when things start going really well for you, because it can't be real, or because something always happens to upset it. Whatever it is, people, as a group don't just suddenly change their behavior, on something as small as you doing well for yourself. The world doesn't revolve around you, people don't revolve around you. Unless you're referring to a small group of people, like a few co-workers, or family, who are directly impacted. If you're talking about people, lots of people, then either you're changing your behavior around those people when you do well for yourself, your doing well for yourself has a significant impact on people for some reason, or your perception is different when your doing well for yourself. Figure out what it is, and remember, you can't change people you can only change yourself. So you can either change how you act in order to change how people around you act or you can change how you react to what people do. But you can only change yourself, not other people.

Jealousy is a motherfucker! Trying to bring you down! (Classis dutch hardcore-lyric)