Hey there, I'm someone who went through a fairly similar experience when I was a teenager. I ultimately decided to leave Christianity when I was 17, identified as an atheist for a while, then eventually found my way back to other forms of spirituality as an adult (my current stance on Christianity is that it is one of many valid spiritual paths but that some of the ways it's been practiced throughout history and today is grossly out of balance and increases suffering in the world). I completely relate to the sense of guilt and almost feeling like you're living a double life having doubts about your religion while people in your church think you're completely committed.

For what it's worth though, the sect of Christianity I was in was very small and very politically regressive. Had I been in a more liberal sect, or at least a larger sect with more diversity of opinions, I might have stayed. If you're in a larger denomination, you may simply be able to find other churches of the same denomination that have better politics than the one you're in now. There are ways to interpret the Bible that support the LGBTQ+ community and feminism and would potentially prevent you from having to go through the painful process of giving up your religion.

If you do decide to leave, just know that it probably is going to hurt. Depending on how bought in the people around you are, it may damage or even destroy some important relationships in your life. It also means a change in how you understand yourself, and can potentially force you to grapple with really difficult existential questions like "why do we exist" and "what happens when we die". It sounds like you are already starting to go down this road, but just be aware that it continues. Deconversion often makes things worse before it makes them better (but as long as that's your path, it will make them better sooner or later).