and about “informed my friends and everyone else about my achievement”,
Grace and humility can be among our shyest attributes but well worth coaxing out and allowing them to take control over some of our other traits. Friends agonizing over hearing from colleges, while perhaps glad for you at some level, are not going to appreciate you parading your "achievement’. Think about someone suffering due to starving whose friend describes the dinner she just had. (yea an exaggeration but sometimes it’s easier to convey a point that way).
And, as I noted, being accepted by Wellesley isn’t simply your “achievement”. It is the outcome of an admissions process that considers factors that are not the least bit related to things you’ve actually accomplished. That isn’t to say that your accomplishments don’t contribute. But so does being a legacy. Lucky you, born in a family that confers certain privileges not shared by others. There is nothing wrong with that, at least in terms of what you’ve done (I oppose legacy/development admits and believe that more, not less, ought to be expected of them to avoid rejection). And, I’m sure you worked very hard and are highly capable. But so are tons of others whose portals will deliver a very different message than you received.
I say all this not to make you feel badly. But, if you were genuinely seeking advice to change the situation and have a result whereby your friends feel better; then you can’t really fake it. You have to embrace grace and humility and take seriously the idea that getting into Wellesley isn’t about your “achievement” in the same way being rejected wouldn’t have been about your “failures”. Most of us “old timers” who suggest students not take rejections as indices about ones values/worth also don’t view acceptances as indices of ones value/worth. It’s not all a “crap shoot” but college admissions involves producing an outcome (admitted or not) of a complex process involving many variables; many that have nothing to do with the student him/her self.
So if you take these point seriously, then you won’t feel that getting into Wellesley was your “achievement”. That understanding will prevent you from saying and doing things that come across as arrogant. It will be easier for you to express empathy (as opposed to sympathy) to others. Those you come across will appreciate you more.