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Be yourself!

...unless you have an abrasive personality, have annoying habits, suffer from mental illness, have severe acne, are a necrophiliac, lack social skills, etc.

Yes, you could be yourself despite all of that, but is it good advice? No. Humans are obligate pack animals. If you are unpleasant to be around, look at or interact with, you will wind up alone. You can't always pick your crowd. Sometimes, you simply must change or cover up the nastiest bits of yourself in order to fit in.