Assalamu Alaikum, Need Some Guidance on Being Dutiful to Parents

Assalamu Alaikum wa rahmatullahi wa barakatuh, Bismillah. I’m in need of advice regarding birr al-walidayn. Alhamdulillah I’m now a legal adult and can make my own choices about religion and other matters. My family aren’t Muslim. My mum is very emotional and my dad is strongly against my decision - may Allah guide them both. They do love me and work hard, but because I chose Islam (and because of a recent exam result) they say I’m a bad son. They’ve threatened to kick me out if I don’t stop. I practice my faith in secrecy and I’m trying to control my resentment and be a better son for the sake of Allah. Alhamdulillah I’ve had some success. My mum found out I’m Muslim three times and made me promise to stop each time; every discovery made their dislike worse. Back then I wasn’t an adult so I couldn’t do much, but now I can choose to move out. I don’t have a steady job yet, though I have some possible opportunities. I’m not fully dependent on them until those are confirmed, Alhamdulillah. If they actually tell me to leave, how should I behave? Previously when they told me to leave I kept quiet and didn’t defend my faith, but I can’t stay silent forever when they demand explanations. They cry a lot over my conversion; they love me but also strongly dislike it, especially my father - he talks about hurting me and kicking me out. My mum would be heartbroken if he did. The last time I was found out was five months ago; I wasn’t an adult then and my mum asked me to leave. Sorry if I repeated myself - I don’t have much experience writing. Please give me any scholarly advice or practical steps that would help. I want to balance honoring my parents and holding on to my faith. InshaAllah things will get better. JazakAllah khair for any help.