New Bi ?? Confused, but very happy

Please I need some advise. I have recently met a girl I really like, she likes me too. I have always been straight and never had any interest in Sam sex or relation ship. She is definitely lesbian and very experienced and I am not at all. My interest is in her for the person and not the gender if that makes any sence
She said she feels very close with me and is very happy also. I am scared to make mistakes and be no good in bed or don't k iw what to do we did talk about it and she is patient. Still I am worried
Is it even real if I have never and am still not attracted to any other woman? Can it be just one?
Please help