Being Hindu

the Brahmin, is the most superior of all the castes and mankind, because he is the most studied in the spiritual scriptures, can teach them himself, is closest to the Divine by virtue of his constant worship

the Brahmin's duty is to lead by example (by being the very flesh and blood incarnation and symbol of worship), worship on behalf of the other castes, lead others to worship the Divine by himself worshipping the Divine

so to be a better Hindu one should imitate the Brahmin and aspire to be as Brahmin as one can be

I'm not sure. You shouldn't imitate Brahmin, if you are not Brahmin by nature. Your varna is prescribed to you according to your guna and karma :

BG 4.13: The four categories of occupations were created by me according to people’s qualities and activities. Although I am the creator of this system, know me to be the non-doer and eternal.

You should try to do your prescribed duty the best you can, instead of acting or trying to be like one of another varna:

BG 3.35: It is far better to perform one’s natural prescribed duty, though tinged with faults, than to perform another’s prescribed duty, though perfectly.
BG 18.47: It is better to do one’s own dharma, even though imperfectly, than to do another’s dharma, even though perfectly. By doing one’s innate duties, a person does not incur sin.
BG 18.48: One should not abandon duties born of one’s nature, even if one sees defects in them, O son of Kunti. Indeed, all endeavors are veiled by some evil, as fire is by smoke.

You should perform your duties just because they are prescribed for you, you shouldn't expect results, benefits or pleasure from them:

BG 2.47: You have a right to perform your prescribed duties, but you are not entitled to the fruits of your actions. Never consider yourself to be the cause of the results of your activities, nor be attached to inaction.
BG 2.48: Be steadfast in the performance of your duty, O Arjun, abandoning attachment to success and failure. Such equanimity is called Yoga.

I'm not a Hindu and I've read only Bhagavad-Gita, so I can be wrong about that or have a wrong understanding on that issue.

What if you're white? What is your "caste" then?