As a transmasculine person I can relate to a lot of this! I feel that I understand the purpose of feminism much more now than I did before I realized I was was not a woman myself. I try to amplify the voices of women, trans women in particular, whenever I can.
Early in my transition I was doing volunteer work in food distribution that included unloading heavy items from a truck. Although I had tried to explain to my fellow volunteers that I now identified as non-binary/trans male, most still saw and referred to me as a woman. One volunteer, a woman actually, would say “Oh that’s too heavy for you, honey, we need to get a man to do this.” I was torn between asserting that I was not a woman, and asserting that gender should not matter when it came to lifting heavy objects.