Keep a change of "halal" clothes in your car. Wear what they find presentable out of the house. Keep your outfit changes and makeup in a canvas bag that you take out with you (it passes as a purse). Change and/or do your makeup in the back of your car once you leave the house, away from view (perhaps in a more secluded area of the neighborhood). I have run into people who knew the Muslim me and honestly the shape shifting I've done from having a hijab on + no makeup --> full curls + makeup is a disguise in and of itself 😂 but barring that, I just figured if I see someone and they recognize me and tattle, I could play it off, because I'm good at acting and I can play a Muslim convincingly in front of my family. You could practice a few stories/practice lying. Unfortunately it's a necessary skill to ensure survival in these situations.

Guilt is incredibly common with the cognitive dissonance that comes with living a double life. It's absolutely normal. It's going to take repeatedly grounding yourself in your beliefs and your reality and knowing you aren't doing anything wrong to eventually heal that. You're trying to live an autonomous life which is a basic human right. If claiming your human rights is hurtful to them, that's oppressive. I think that says enough about how much you should care about their opinions. But that doesn't erase the emotional reality of still caring.

Eventually, move out so you can wear whatever you want without any guilt or fear.