Where acceptance is all there is
I'll keep my reply somewhat brief because there has been quite a bit of discussion about these matters -- here and here, for example -- on AlopeciaWorld.com.
I agree wholeheartedly with John on this one, though I must add that I'm certainly not to be counted amount "the vast majority" of men Mari has encountered. Although my fiancee, Cheryl, has always been altogether lovely to me, neither her alopecia or her preferred bald look has been the main or basic reason I'm attracted to her and love her so. Neither is an issue per se when it comes to any aspect of our love life, but if it were, Cheryl would have good reason to to be as concerned as Mari.
So no, Mari, you are not being "too sensitive." And yes, Mari, you should want to be with a man whose more into you than the prurient possibilities he sees in/on your alopecic or bald head. But don't let such shallow men get you down; you encounter them so often because most men -- and most women -- take shallow and silly approaches to their so-called intimate relationships. The key is to not only wait patiently for your Mr. Right, but to also make sure that your own maturity and growth has prepared you to recognize and appreciate a truly good man who's truly a man of substance.