I gave my 1st BJ the summer between 8th and 9th grades, and gave a BBC my ass a couple months later.
I dressed gender "neutral" all through high school and started cross-dressing and taking hormones my freshman year in college.
I went fulltime living as a female 24/7 my soph year and have been ever since. I have had several surgeries to transform my body and will complete the process next year. I also have found that many BBC, while they do not identify as bisexual are very open to an "encounter" with a white girl that has a little "extra". The key for me has been to make sure than before you unzip them, they know what they are getting