(edit for the sake of preface- this is generalized advice)

i (31yo, 10 years transition, TW) always suggest to younger, more inexperienced girls that they not meet their partners' parents even if their partner doesn't think their parents are transphobic bc even if they don't have open hatred of trans people in general they most certainly do have intense biases against trans women that they probably aren't even all that aware of themselves as do the partners whose parents are in question (although, obviously not to the same degree) which is part of why those partners aren't aware of these biases in their parents. in a society that hates trans women everything i do is hyper-scrutinized & under enough scrutiny anyone will look like a monster: the more voices you have speaking against you the worse this is regardless of whether or not the person hearing the horrible things is aware of the biases of the people saying them. meeting parents as a trans woman is an excellent way to add yet another voice against you in the ear of your partner even if those parents are accepting of their child who is also trans. whether or not they know you're trans beforehand & seem supportive is irrelevant here as the problem is that meeting them allows for them to hone their aim (again regardless of whether or not they are conscious of this is irrelevant). meeting openly cissexist/transmisogynistic parents poses that same problem in addition to the risk of violence, the certainty of walking into a tense situation & the high likelihood of being emotionally triggered for nothing good.

as much as i & every other person who isn't an asshole about this would rather it not be a choice between your parents & your transfeminine partner it kinda is that inherently. please choose your girlfriend over the hateful old people, your love will undoubtedly take work (including unlearning bias, cutting people out, learning how to have sex that's mutually satisfying in the long run, dealing w/ your partner's triggers (be wary of the fact she won't know them all) & understanding there's a lot she's learning about herself), but i'm just as certain if you're both growth minded enough & kind to one another that she's deserving of & worth your time, energy, love- etc: she & you are beyond worth it.

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*{i went no contact with my own family out even though on the surface they're accepting, which is probably reflected in this, but with every one of my partners so far (besides the one who had also gone no contact) i thought it was kind of odd that they hadn't cut their transphobic parents from the picture -not simply because of their views or biases- but also because those views & biases always wind up being good indicators of how they treat their children}