Missing someone

I miss someone, this is the words truly out of my heart, but I really don't know who I really miss. I never mean to be a guy who has lots of girlfriends or lovers.
By asking me self again and again from day today, I wish the answer is "I don't know",

I want , don't want, love, don't love, miss, don't miss do I really can not answer myself.

Hummmm, I hope driving myself with study and job can help me on this!