If you think something looks good on you, then get it. Do your hair occasionally. Buy bubble bath. If you want that candy bar, go eat it. If something makes you happy, do it.
Happiness goes a long way towards being beautiful.
The more we hear something, the more we tend to believe it. The more we believe it, the more it becomes true. But when I started to accept the compliments, I started believing them a little, and when I believed them a little it started to radiate from within. The more I believed, the more it radiated, which caught the attention of more people, who in turn would compliment me, which would cause the radiation to be greater, and so on and so forth. While all of this is great advice, the fact of the matter is that there WILL be people who have negative things to say.