It is hard accepting it yourself the first time, after you have a bit of fun (flirting or having flings with the same sex), you start wanting to start something serious with the same sex like make new friends who are bi, gay, transgender ect or even start dating someone whom is the same gender as you!
The next step is being open about it and coming out, I am a FtM transvestite (meaning, I was born female, I am female but I dress & act male) and I too am bisexual but I prefer girls more to guys.
Anywho, the first time I knew I liked/preferred women was when I was six years old and got transferred to another elementary school; By the time I reached puberty, I become more & more curious about my sexuality so I started to embrace it, I began having flings with other female classmates in the gym changing rooms, my actual first crush was a female (older & hot one) too, I only started coming out though around the age of 17 and it was the most difficult & very uncomfortable situation in my whole entire life!
My mom was totally fine about and kind of knew that I was into other girls, my dad on the other hand never accepted it and was truly heartbroken, the first time he knew was when I was 7 years old and fell in love for the first time.
My brother & sister both love me to pieces and wouldn't even care if I was into beastality (not that I am) because they are my family, my siblings, my own flesh & blood and they love me unconditionally!
Through out my school, home, college & even social life, I have been bullied & judged upon my sexual preference, people have always used my sexual orientation as a weapon, I almost lost my placement at college, I have been reported for harassment in school & I have had been called every name under the sun in clubs, on the streets and everywhere else!
I have had fall outs with my mother & sister over my feelings towards other women too!
The fact is is that I am and always will be interested in women, I love women, they are my true weakness, I always like to have men as friend and women as girlfriends, I some times get attracted to men or have an occasionally boyfriend from time to time but I love girls and always will and nothing or no-one can change that, I have already tried to force myself to be straight and let me tell you, it is IMPOSSIBLE!
Once you've had your first taste, you become addicted!
Good luck and have fun!