It can be if you let it be. Typically people start out as bisexual and then feel more comfortable about there sexual orientation.
Bisexuality is in no way a phase, and thinking that it is is very ignorant. Truly a girl or a boy could discover the same gender and become bisexual, and eventually lose interest, but by no means is bisexuality a phase. Most bisexuals are bisexual for life weather they will admit it or not, for fear of rejection or one reason or another. Be sensitive, bisexuality is not easy, although being bi or gay is becoming more and more asepted this kind of attitude does not help in any way shape or form.
Keep doing what you're doing and prove them wrong. If they want to believe you are just going through a phase only time will change their minds.
Sunflower is bisexual
Everybody experiments growing up. It may be a phase or the first indications of being Gay or Lesbian. It is no big deal, let it play itself out and see what develops.
Bisexual as mango is.
Bisexual
No he is not bisexual.
When you are bisexual, you do the exact same things as a non-bisexual person.
She is definitely not bisexual.
Stevie is not bisexual.
sexual orientation cannot be changed. If someone is bisexual, they are bisexual for life.
Nobody turns bisexual. If a woman is bisexual, she has always been bisexual.