Hey listen... I didn't get married until my late 40's - I mean like I was almost 50. I dated every scoundrel, every womanizing jerk, a bunch of substance abusers... One guy turned out to be gay (which is cool, but I wish he had figured that out before I fell in love with him). I was with one guy for 8 years who broke our engagement a month before the wedding. I was 39 at the time and let me tell you that sucked badly and took me a couple years to get over it. Heck, I am still not over some of it :-)
So let me speak about hair. There isn't a man alive who doesn't look good without hair. Believe me, I have dated men with all kinds of hair or lack thereof. My husband is thinning faster than snow melts in the spring which emphasizes his large, LARGE nose - I still think him cute and loveable. Women don't fall in love with hair they fall in love with whats under the scalp....brains. Billy Bob Thornton is not good looking, nor does he have a full head of hair and he married Angelina Jolie - that wasn't about his looks. Bruce Willis thinned way out then just buzzed it till it was shiney - didn't hurt his career any and his second wife married him bald and I think she is like 30 to his almost 60 years old. Women fall in love with kindness, generosity, good conversation, some humor. If you can cook that is a big plus in my book :-)
I suffer depression - bad, life questioning depression - but the thing is that as low as I can get (frequently) I am nosey enough that I want to know what happens next. As soon as I am dead there is no answer to my curiosity, just dead. Boring idea. Even if I have to just get into a political argument with my politics friends on Facebook it changes the mood from depression to debate mode. Then my thoughts go to "what is that dimwit going to say next?" Get the blood boiling on a topic that is not about "me." Find a goto activity that is not about the self. Binge watch a few seasons of a TV show is a great way to get out of "self" too (I recommend anything Star Trek - speaking of which, Captain Picard is extremely sexy), rescue a dog and love him to pieces (a dog loving man is sexy BTW) - did I mention learn how to cook something awesome :-)
Above all else remember that your college years are growing years (your brain is not an adult yet) and emotional ups and downs are way normal - everything, and I mean everything - is writ large and seems like the most important thing in the world. And you know, right this minute it may be the most important thing, in a year or 5 years it will not be important to you at all.
Promise yourself to revisit this period of time when you are 35 years old and you will be amazed by what you didn't know about yourself (or the world) in your 20's. At 45 you will look at 35 years old and be even more amazed at how emotionally smart you have become :-)
Good luck and kick some butt in your studies!