I would work hard as you're doing, trying to keep your eyes on your goals rather than worry about what other people are doing or saying about you or your goals; that's their stuff, they sound jealous or insecure because you are doing so well. There will always be people trying to tear other people down to their level and unless that interests you (I was a sociology major in college :-) then just ignore them. Don't spend the time thinking about what they're saying or doing, you have your hands full trying to be the best you can be and get what you want out of life.