I am 20yrs old and my wedding date is a month before I turn 21 (yes, I know I'm young). The man I'm marrying is one that I've known well for five years, and we've dated for a little over two. Marriage is not something we take lightly and while we both realize we are young, we know this is what we want and believe to be best for us.
Currently, we are both in college and will be attending Graduate school after we are married. Obviously we have plenty of details to consider since we are so young and still in school, but one issue that keeps reoccurring is trying to decide what to do about the bridal party.
Unfortunately, I really don't have any girlfriends I am close enough with to ask to be bridesmaids. Mostly because I am not the typical college student and do not enjoy spending time in bars partying, which is what my friends enjoy doing. I also grew a part from my childhood friends. That being said, I feel like the best thing to do would be to ask my family members to be my bridesmaids. I'm very close to my sister, and my three cousins (all girls) so I think it would be a good idea to make them part of the wedding instead of asking other girls who I really don't care to be around much. The only problem is, the four girls are all younger than 18. When I get married my oldest cousin will be 17, the other two cousins will be 15 and 12, and my sister (the MOH) will be 15.
I'm really concerned that these girls are just too young for their roles as BM's. Especially since the groomsmen will all be around 21-23 years old. (I feel like that would make for a VERY awkward situation.)
My cousin’s parents are completely fine with paying for the girl's dresses and other expenses, so that's not an issue. I also do not want a bachelorette party so that's not a problem either since the girls would usually have to plan that. My only concern is that I don't want to look back at pictures of my wedding, and think that it looks like a bunch of girls "playing" wedding. If I don't ask my family members to be my BM's, then I really have no idea who I would ask.
Should I ask my young cousins, or figure out something else? Any advice is welcomed! 
Re: Young Bride - Even Younger Bridesmaids
Don't worry about the age gap between your girls and his guys. You're not actually matching them up during your wedding!
You choose your wedding party because you are close to them, not for how they will look in photos.
Yes, they will look young. So will you. Because you are all young. Don't pick other people just yo raise the age range of your wedding party.
Also, it doesn't matter how old the groomsmen are. They aren't hooking up with the bridesmaids. If it makes you feel better, have them walk down the aisle single file instead of coupled up.
Websites/blogs where our wedding has been featured:
http://www.dapperq.com/2013/11/a-very-dapper-wedding/
http://www.onabicyclebuiltfortwo.com/2013/10/wedding-christina-g.html
http://4realequalityweddings.com/2014/05/16/g-christina/
(And I should have clarified about the bar situation as well
I was going to say this. Of course, family is great to have, regardless of age, because friends come and go but family is forever. However, are there any guys that you're close to? One of my best friends is a guy and he's a brides man. He's also ready to step in as man of honor should an issue with my sister come up (very long story)
It was not awkward at all. @acd818, why do you think it would a "very awkward situation"?