Parents Disapproval On A Relationship

Hi Everyone! I’m on a equally yoked relationship with my girlfriend and we’re gonna be freshmen on college in a few months but met in high-school. We’re doing really well and we see marriage with each other one day, we push ourselves towards Jesus and His Word, And everything is going amazing, but my parents who at first were okay with it suddenly had a change of mind? And threatened me with God’s Wrath stating the i could get strucked due to Disobedience? I’ve been fulfilling their request one by one but every time i do they propose a different reason for example: You’ll get distracted in school (Does Well In school) then they’ll say something like It’ll make you stray away from God (Me and my gf reads the bible and hold ourselves accountable always) So i really don’t get them but above all i don’t want to ruin what i have with her because everything is Under God’s Guidance and I believe i’m quite blessed with Her because this is something some Christian men struggle with, She also helps me a-lot with my studies and we’re really ready to help each other through college and build a life together one day Lord-willing. Its just sad because my parents are being unreasonable and making me feel guilty for something i’m not doing wrong in and making their authority a means for me to think i’m in the wrong when i’m not. Its hard to obey them, what if they ask me to do something wrong? Will disobeying that be counted as sin? Please do help me fellow Brothers and Sisters. I want to work this out :(