Dealing with insecurities?

I just read that "some people try to find other's weaknesses, so they can dominate them". See, I never thought of that...but reading that makes me wonder if thats what I was trying to do, without me knowing that myself... When I meet someone, I tend to explore more about the weakness of that person, than their achievements. I feel like I can be close to them via that route! But then, other's achievements makes me feel less worthy. I think I'm kinda insecure, but don't know what I can do about it. Also, I'm always there when people go through rough time...but they tend to forget me when they're having a good time :/ What ways can I deal with my insecurities...how can I also accept other's achievements?

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