&gt; I resent her for it 

You resent someone because of stuff they have no control over?

&gt; I guess I feel overshadowed because she is more popular in college. 

Wait, there is something such has popularity in college?  

&gt;  Because fact is that the classmate is super friendly and sociable and a generally nice person, and I hate myself for disliking her irrationally. How do I get over it and not be so irrational? 

You are literally mad at someone for something they cannot control, aka name, birthday and their personality.  You want her to not be herself so you can feel better?

&amp;#x200B;

You think your friends like her more than you?  If it's that bad, find new friends.