Omnisexuality is when you are sexually attracted to all genders, but still see that person's gender, and their gender plays a role in the attraction. Polysexuality is when you are sexually attracted to multiple genders. Being romantically attracted to someone is different from sexual attraction.
I'm still learning about this stuff too, but I hope this helps! Your English is good too.
If anyone else can make this clearer, please do. I'm not good at explaining things... :'D