I guarantee when you graduate, get a job, and start working, you will not give a damn about what your peers are doing, because you'll be too busy enjoying yourself(provided you didn't pick a bad major).
Things change quick. How do you know you won't shoot off quick in your career and pass them up in a short time period? That's what happened when I got my MBA. Things spooled up real fast. If I could have told 22 year old me what the deal was going to be in 6 years I'd have been way less stressed. But I didn't know that back then, so I had to keep working till I got to where I am.
We all run a different race and we all are going to the same place eventually(in the ground) so don't trip too hard. Don't worry about the wife and kids thing either. As a man, you can get that at any time in your late 20's 30's and 40's. EASILY. And from what I see it ain't the best move to make if you enjoy your freedom anyway. I know few happily married people.
You'll always feel like a loser in some way if you compare yourself too much to others, because there's so many levels of success.
Take Derrick Rose for example. Guy is a few years younger than me, he made 20 mill last year, lives in the most expensive building in my city, is on TV, has his own shoe deal, headphone deal, newborn son, and a model gf. I could easily feel like a loser if I wasn't thankful for the things I do have in my life (career, education, family, etc), so keep your head up about it.