Underage wedding🤷🏻‍♀️

My husbands brother is getting married in November, he just turned 18 and his soon to be wife will be 17 when they get married. She’s starting 11th grade in a few days so she needs 2 years to graduate. At first I thought awe that’s so cute they’re getting married now I’m like wait she should finish school at least before she gets married so she knows if that’s really what she wants and so she can make something out of herself. Housewife life isn’t all that fun, coming from a housewife. Anyway I don’t agree with it, they want us to help pay some stuff for the wedding and use our truck to take them to the venue. I told my husband nope not going to happen we haven’t had our wedding because we don’t want to be asking around for money and I’d rather her graduate high school first because who knows she might find someone she likes more or idk. My BIL is getting about $320 a week, has no car to get to work and back so my husband gives him rides everyday, plus he has a drinking problem AND HES ONLY 18! So I told my husband we weren’t going to help pay anything and everyone is saying I’m the bad guy, I’m only looking out for them both. We had our first baby at 18/19, graduated from a technical college as a welder and cosmetologist so we were getting the good $$ and it was still hard to adjust at a young age. Am I being dramatic or am I right to not want to be part of this?

UPDATE

Both sides of parents are being supportive, they are paying most of the wedding and are also the ones asking around to get helped. That we know of she isn’t pregnant, I don’t see the rush in this but they’ve already paid to save the venue for that date and are already looking for wedding dresses. 💸💸💸