From the 2010 census:
Non-Hispanic whites: 63%
Black and African Americans: 12.4%
Hispanic or Latinos: 18.3%
Asian Americans: 6%
American Indians / Alaskan Natives: 0.8%
Native Hawaiians and other Pacific Islanders: 0.1%
Middle Easterners and North Africans: 0.6%
Self-identified multiracial Americans: 2.3%
Here's the only statistics I could find for gay/Lesbians that aren't lumped into "LGBT" (from UCLA School of Law, for some reason, April 2011):
An estimated 3.5% of adults in the United States identify as lesbian, gay, or bisexual and an estimated 0.3% of adults are transgender.
This implies that there are approximately 9 million LGBT Americans, a figure roughly equivalent to the population of New Jersey.
Among adults who identify as LGB, bisexuals comprise a slight majority (1.8% compared to 1.7% who identify as lesbian or gay).
Women are substantially more likely than men to identify as bisexual. Bisexuals comprise more than half of the lesbian and bisexual population among women in eight of the nine surveys considered in the brief. Conversely, gay men comprise substantially more than half of gay and bisexual men in seven of the nine surveys.
Estimates of those who report any lifetime same-sex sexual behavior and any same-sex sexual attraction are substantially higher than estimates of those who identify as LGB. An estimated 19 million Americans (8.2%) report that they have engaged in same-sex sexual behavior and nearly 25.6 million Americans (11%) acknowledge at least some same-sex sexual attraction.