The extent to which I get jealous depends on the situation and what exactly I want. If it's something I feel I deserve, then I'd be jealous. However, in the past, I would have tried to well, destroy whoever has what I want, but now I just accept it and try to eventually get whatever it is that I actually want.
Oh and if people think of better ideas than me, I get jealous, but if it's my friends, I'm less likely to get jealous and accept it. Same thing goes for if they get something I want and they're my friend, I feel happy for them.