My fiancé

So I'm Bosnian and my parents want me marrying someone who's Bosnian and it really sucks because behind there back I've been with my fiancé for 3 years and hes absolutely perfect hes not Bosnian and I'm scared to tell them cuz ik my mom will never speak to me again even though her and my dad are seperated and her fiancé is polish and Italian. I've had a lot of boyfriends and they always only last 3 months untill she buts in and starts arguing with me and he ends up leaving me cuz of her and her yelling at me cuz I'm not marrying someone who's Bosnian i just wanna be happy and in i wanna marry him but i also know if we do get married shes not gonna speak to me ever and she wont show up to the wedding