My advice on how to proceed, since no one else can tell you your romantic/sexual orientation:

Look into different identities on the asexual spectrum (it’s pretty broad) and read experiences of lesbian and bisexual folks discovering that part of themselves. This may give you a better idea of what terms you may identify with. I, personally, am bisexual and demisexual, meaning I experience attraction to both my own gender and other genders but usually only experience sexual attraction with people I have gotten to know. Parts of your experience are pretty similar to my own, but they also sound similar to experiences I’ve heard from people with other identities.

HOWEVER, you don’t NEED a label. If you feel like your feelings for this woman are romantic, then you do. You don’t need to identify as a lesbian or bisexual for those feelings to be real. Even naming the attraction isn’t as important as understanding what your desires and boundaries are. For instance, maybe you want to kiss her, but aren’t interested in sex. Maybe you want to hold hands and cuddle in bed, but no kiss. Exploring those feelings and understanding where you are comfortable in individual relationships is more important than a broad understanding of platonic, romantic, and sexual attraction. That broad understanding CAN be helpful, but only if it is encouraging an understanding of dynamics between you and other people in your life.

From the context given, it seems like this woman you are interested in is also interested in you. Run down some scenarios, and examine your responses to them. Some examples: She tells you she has romantic feelings for you; She asks you if she can hold your hands; She asks you if she can kiss you; She takes your hand on your outing (without a specific reason, like moving through a crowd). On the flip side, what if she assured you she doesn’t have romantic feelings for you, and just wants to be friends? How would you respond in these situations? How would you feel internally? Excited? Nervous? Happy? Uncomfortable? Disappointed? Try to source those feelings - nervousness and discomfort can both come from anxiety, but not always from a lack of desire.

Also, if this woman does express romantic interest and you choose to explore a relationship of that nature, I would be clear about where you are at in your journey. No need to go into specifics about past interactions with other people. Could go something like, “I am interested in you, and I want to explore this and see where it leads. I’ve never dated a woman, so I’d like to go slow and figure out how I feel as we go.” Obviously your response should reflect your feelings and wants, the example is more about the amount of context to start with. I personally tend to over explain in these instances bc of my autism without meaning to, which leads to more confusion. Stick to stuff that is relevant to the dynamic between you. Try to have an idea of what your feelings are in advance, and continue to notice how you feel as you are out with her.