Don't listen to what other students say what's good what's not. Make ur Own decisin. Remember this: ( Make ur choices or else the choices will make u).

Do what u think is good. If u cannot cope up go for counciling. To let all ya stress out. One more thing start working alone in the gym without any friends; to get ur stress level down. Trust me It works.
One more thing just keep on going; Don't give up!! And try to stay away from the people who doesn,t give a shet about u. Stick wit da people who cares about u & give u a hand when u are down.
References :

It is important to try to find other sources of support so you don't get burned out, so take a few social risks to do so…

There are lots of great tips for dealing with people who don't always deal in positivity – my favorite is to send them all love. Can't go wrong there, trust me on that! It'll come back to you.

I have been in a similar situation. This book really helped me (and I don't suggest books lightly):

http://www.amazon.com/Four-Agreements-Practical-Personal-Freedom/dp/1878424505/ref=pd_bbs_sr_1/103-0612996-1733443?ie=UTF8&s=books&qid=1173160147&sr=8-1

At least consider reading about the four agreements on the internet. It changed my life anyhow.

If you are really struggling, consider seeking counseling. Many schools and communities offer free or reduced fee services if money is a problem. If worst comes to worst, you can (and should) ask local practitioners for a referral to a free or reduced cost service. You'll get help finding someone right for you pretty quick with that approach.

Stay strong, concentrate on celebrating your power and inner light (and not the power of those around you)!

I'll add you to my prayers for the night .

*******

I just wanted to add (using copy and paste) a breif description of the four agreements (taken from a review on Amazon.com):

Be Impeccable With Your Word: Speak with integrity. Say only what you mean. Avoid using the word to speak against yourself or to gossip about others. Use the power of your word in the direction of truth and love.

Don't Take Anything Personally: Nothing others do is because of you. What others say and do is a projection of their own reality, their own dream. When you are immune to the opinions and actions of others, you won't be the victim of needless suffering.

Don't Make Assumptions: Find the courage to ask questions and to express what you really want. Communicate with others as clearly as you can to avoid misunderstandings, sadness, and drama. With just this one agreement, you can completely transform your life.

Always Do Your Best: Your best is going to change from moment to moment; it will be different when you are healthy as opposed to sick. Under any circumstance, simply do your best, and you will avoid self-judgment, self-abuse, and regret.
References :
In a lot of ways, I sympathize with what you wrote…I know what it means to feel socially squeezed out and bullied in the context of a competitive program…