There was once a wise old spider and all the confused young gharials would come to him and ask "Oh wise old spidery spider, I ever so confused, I have so many problems, please help me and give me some of your wisdom, you decrepit little turd."
The spider would briefly ponder in his tiny wheelchair before professing "You need not worry! Just be yourself and do not worry what other people think of you! Live today as if it were your last!" to which the gharial would reply "THANK YOU!" and swim off to make a sandwich or whatever they do these days.
Anyway, the moral of the story is that the spider is a complete moron who gives lame advice.
Firstly, there is no way you can't be yourself. In fact, it's the only thing you can't not do. If there's anything intrinsic to your being then it's that you are yourself (actually, I think the cogito is bogus but I'm ranting here so shut up). You can't be anyone else. Sure, you can pretend to like things you don't actually like but that doesn't mean you're now Edward P. Kasawari and you're no longer Hilary St. Motorvehicleexplosion.
Secondly, if you don't consider what other people will think of you then you won't get anywhere in this world because humans are evidenly social beings. There are many of us and we are in constant contact. Thinking about what other people will think of you isn't just acceptable, it's functional, baby. Fucntional like a vacuum cleaner.
Finally, if you live every day like it's your last then you'll never get anything done, you won't be able to save any money, you can't do anything that involves more than 23 hours and 59 minutes of planning, preparation or forethought and you'll probably end up in some kind of prison. I don't know anyone who genuinely lives every day as if it were their last and if I ever do meet someone who does, I'll dropkick them into a swimming pool full of dropkicks.
Eat 5 steaks a day, treat your wife as an object and always treat old ladies as bomb threats.
These words are more appropriate for anyone finding their way in life.
Thank me with money.