@crayon851,
Certainly one doesn't need to get to married and if we could turn off the parts of our beings that long for connection and relation to others then, theoretically, we could devote ourselves to something bigger for mankind. I get where you're coming from.
However there is something you get from having a lover, significant other, soulmate, spouse, etc... depending on how uplifting the relationship is. At it's best you get to know and be known, to connect deeply to someone who isn't you, to give love and to receive it, to appreciate friendship and humor. If you are good to each other you get to lean and be leaned on, stimulate each others brains and hearts, and possibly even become your best self because of the unique effect a person can have on you're outlook. At it's worst you get neglect, pressure, loss of self, disconnectedness, obligation, and misery. If you are lucky in life you may get both so that you can learn enough lessons from the worst case to know how to find and appreciate the best case. All of this is, of course, quite separate from the legal institution of marriage.