Your orientation as it relates to you and your orientation as it relates to society are both important. A lesbian and a straight cis man are both attracted to women, but their experiences are very different, so I think having multiple options that we can use to describe our experiences is great. We find power in finding the right words to understand ourselves :)
Often, a lot of trans girls early in their journey of self ownership hesitate to use the label lesbian for themselves, because imposter syndrome is hard to overcome.
But that gets better with time too.
Either way, it doesn't matter what labels you use or why, what matters is that they are the labels that are helping to empower you and helping you to navigate the world. If they're doing that, they're the right labels :)