Race is largely meaningless. You should feel neither proud nor ashamed of your race.
Culture on the other hand is far from meaningless. I'm proud of the positive contributions western european culture (and its offshoots) have made to the world.
Most notably being the source of about 90% of the scientific and technological advancements of the last 500 years and the source of most of the rights revolutions like anti-racism, anti-sexism, anti-homophobia, anti-animal cruelty etc.
White power, on the other hand, is not about a sense of pride for the general accomplishments for white people (that pride is built into society already) but rather a pride that stems from their ability and success as oppressors.
Oppression has been almost constant throughout human history and has been practiced by every single group. The fact that white people are generally better off today has very little to do with oppression, and a whole lot to do with the Industrial revolution.
Which is why the non-white people who were oppressors throughout the same periods (e.g The Ottomans), are NOT rich today despite their oppression. But societies who had very little oppression but DID industrialise (like Japan), are rich.