I can't say if you're bisexual or heterosexual based on such little you provided us here.
My sex therapist thinks that my problem is maybe OCD and my psychiatrist too. They consider that im so old to be curious about sexuality and im 100% attracted to women. So, id like to know about your opinion, and thank you so much.
But based on those several sentences I can say, FIRE your therapist and psychiatrist already. If there was any justice in this world, these two would lose their respective licenses to practice therapy/psychiatry.
Taking your claim at face value that you're 25 years old? And the fluid nature of gender and sexual orientation and that these two issues have been codified by science for much of the realm of global studying of human sexuality.
You are NOT too "old to be curious about sexuality."
It seems your sexual therapist and psychiatrist both have a deep conservative bias and agenda that they're entrenched in with their respective practices. They'll end up doing more damage to their patients than good.