Attending weddings, With your boyfriend. Options

[lilxroxy]

So, my boyfriend of 6 months invited me to go to his cousin's wedding with him in late October...
While I'm thrilled and honored, I am also incredibly wary.
You see, in my opinion I feel like this is something on the serious side.
After telling one of my really close conservative friend about this today, she was kind of skeptical and told me that she doesn't think it's a good idea. Mainly because it would make me seem like I'm a girl without manners?
I don't know.

If I go, I will be staying with him at his uncle's house (in the basement while his brother takes the guest room).
I'm Asian and my boyfriend is Caucasian so there's definitely some culture gap despite the fact that I'm a third cultured kid.

What do you guys think? Is this a big deal or am I overthinking the entire situation? Should I go or not? And what are some wedding etiquette that I should be aware of?

[lilxroxy]

I will be turning 20 before the wedding. We're both college sophomores in Florida and the wedding is going to be in Baltimore, MD.
My mom knows a lot about our relationship details and what not. I think she's okay with me attending the wedding...? It's just we'll be flying up there and as long as I'll find a way to pay for it then it's okay.
What I mean by "without manners" is that I may come off as a girl without chastity or discipline or something of the sort..
I am concerned because I feel like there are always conservative people out there - regardless of their ethnicity background - and I don't want to completely disregard all the details of tradition because I'm acting on impulse and not thinking thoroughly.