While, it is almost normal to feel somewhat depressed to see the results of others which you could not attain or achieve but this all depends on individual differences. For someone like me, I like situations where people are excelling, exploring and making progress. This is always a source of motivation to me, it spurs me up, it sparks the flame in me and gives me confidence that I can even achieve more if I put my mind into it. There is nothing that cannot be achieved if we dedicate our time and we have our minds fixated on it. I do not like to be dwelling amongst places where there is always complaints, lamentations and no progress, it makes me feel like I cannot grow beyond such situations so ultimately, I like mixing myself with like-minds, where only growth is the goal or the watchword. There is always the satisfaction I get when I see people achieve things I could achieve at that moment, I believe and work towards achieving more goals which might be greater than what other achieved or what people may likely think as unachievable. There is no need being annoyed, jealous or pessimistic when people are excelling, rather you should merry with them and strive harder!