So masturbating while not being interested in sex is totally normal. Having a libido is seperate from experiancing sexual attraction. Whether youre not into sex because youre just asexual, or because of trauma reasons is something that takes time to figure out. But both are completely valid. Its completely okay to use the label asexual, and discover youre actually more demi later. Id have a talk wish your partner about it sooner rather than later, so they know. Then accepting you and working with you on it, will make it easier to know which box feels most right
Thank you so much) I do think that in the close time I'd need to talk to a therapist or a sexologist about this issue, because I have absolutely no idea of how to figure out if I'm just traumatized or not. And I did talk to my partner about this, and they said it'll be absolutely okay even if I came out as asexual. But I do feel like a coward declining them their basic needs, because the fact that they want me is definitely not something to be treated as repulsive behaviour