I think the most important tip in life is something my dad taught me early on.
Don't compete with others, only with yourself. You need to be aware of what others are doing, but people who compete with others will always be behind and will never be truly successful because there's always going to be somebody better. If you take the energy and focus that you instinctively want to turn towards other people and turn it towards doing the absolute best you can possibly do in everything that you do, then you will be successful. Someone who doesn't compare themselves to others never has to sell themselves be it to a client, on a job interview, to the opposite sex, or to other people in any context, who you are and what you do will speak for itself. No need to convince anyone that they want to be associated with you, because they'll want to be already.
He was so right too, when I look at what I've accomplished in my life already and what I have yet to do in life concentrating on myself and what I'm doing and gauging my skill against what I think I could do instead of what other people are doing is what made it possible.
Try it, play a board game or poker or something like that to try and be the best you can be. Monopoly is a good game to try this with. Try and build an empire and watch what others are doing, but don't try to be better than them. Just try and be as good as you can be and top what you've done before. You'll win every time, they'll be so worried about you and trying to make the right moves around you that they can't concentrate on their own game, and you will win.