meditation is normally the best answer, just think about it. what being jumps out at you, what culture do you feel drawn to, what do you feel closest with.
for example, Bastet [or however way you wish to spell it] i've always love Egyptology, love music, rather gifted with instruments, love cats, cats seem to like me, and when i was a child i had dreams about people with cat heads. that's mainly why i chose her. i also chose dragons for the same reason, i love reptiles, i've always been fascinated by them, never really feared them, thought they were very wise and interesting.
point is, you might be over thinking it. just sit back and think about some things that you feel represent you, what you feel protects you and/or centers you.