Interfaith relationship!

Ive been with my boyfriend of two years as a muslim girl, and he is christian and very respectful. We are making it work but my mum keeps on telling me hes great but he’s christian, you will go to hell for eternity for marrying this guy later.

But I just feel like, confused.

I want to marry him later. I want a general idea as to what to do with our relationship. I’m only 18 with him in a month’s time anyway.

I just feel agitated about religion to some extent, with how its forbidden for me to marry him so ‘marrying him’ is ‘adultery’. Im committing to him, I’m doing the best I can to be a good person with some worship, I’m not so practicing as you can tell, but I just think if God, is omnibenevolent, he should want you to be happy in life also. I just believe in islam but a little differently from my own perspective. Its weird. I just feel upset when my mum says ill go to hell after.