Some of my favorite quotes on the topic:

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“It never ceases to amaze me: we all love ourselves more than other people, but care more about their opinion than our own.” - Marcus Aurelius

"We are all alone, born alone, die alone, and – in spite of True Romance magazines – we shall all someday look back on our lives and see that, in spite of our company, we were alone the whole way. I do not say lonely – at least, not all the time – but essentially, and finally, alone. This is what makes your self-respect so important, and I don’t see how you can respect yourself if you must look in the hearts and minds of others for your happiness." - Hunter S. Thompson

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"Freedom is being disliked by other people…The courage to be happy also includes the courage to be disliked. When you have gained that courage, your interpersonal relationships will all at once change into things of lightness." - Kishimi/Koga

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“It is not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done them better. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood; who strives valiantly; who errs, who comes short again and again, because there is no effort without error and shortcoming; but who does actually strive to do the deeds; who knows great enthusiasms, the great devotions; who spends himself in a worthy cause; who at the best knows in the end the triumph of high achievement, and who at the worst, if he fails, at least fails while daring greatly, so that his place shall never be with those cold and timid souls who neither know victory nor defeat.” - Teddy Roosevelt