parent attraction?

Hi, Im a 18 years old bisexual male, and yesterday I just suddenly mentioned to myself that somewhere between 14-15 years old, for something like a few months, I was sexually fantasizing about my father.
im so freaked out now. is it normal? what does it mean?? please help me, im really anxious.
BTW, I might have some grammer mistakes, sorry about that...

dont get me wrong, I didnt really wanted something sexual with him, or tried to seduce him, but thinking about his body used to get me aroused.. I dont think I even fantasized about doing something sexual with him, but, again - I got aroused by his body.. I never wanted to act on these thoughts.
damn, I remember now that touching his fallen body hair(after he took a shower) also used to get me aroused(I used to be aroused by hairy big guys).
im not aroused by him anymore. as I said - it was a pretty short period of time, but its still freaking me out.
my life is pretty normal and I was never sexually abused or something like that. I was always fine with my father and always liked him as a father(even at the period of time when I had sexual thoughts about him). theres even a girl that I love and sexually attracted to, but in these last two days I cant think about nothing but the anxiety and the fear.. please help me. is it common for bi/gay guys to have sexual thoughts about their father for a period of time in their lives/during the puberty/when they're pretty newly aware of their sexuality?
im afraid that it means something about my relationship with my father, or makes me exlusively gay, and not BI as I always knew I am.

please someone help me...

Hold on my friend, somebody will be along who can relate to you or help you a bit more than I could

Hi Miraclesleeper, welcome.

I wouldn't worry too much. Sexuality is incredibly fluid during puberty. You say yourself this phase has passed and therefore I wouldn't pay it too much heed. You'll be fine.

I agree with GinaSmith. This might not be extremely common but it is within the realm of 'normal' for a teenager, and you said it doesn't happen anymore and only did for a bit. Please don't worry.

thank you guys, I really appreciate it, really.
but for some reason I still afraid - what if this fact makes me exlusively gay?? but how can it be? I get an erection every time just hugging this girl that I love.. or by thinking sexually about her. damn, I love her! or maybe not..?
or even worse - what if it makes me a girl?! because usually it happens between a boy and his mother, or a girl and her father... I didnt heard much of similar cases between a boy and his father... some of you did? oh god please what is going on with me?!
I cant be a tranny! I always liked my male organs, being masculine always felt great! or getting compliments about masculinity (like "wow your voice have changed!" or "how did you get your muscles without doing anything?!"), I never wanted to have female organs, never wanted to dress like a woman...
someone just kill me or something.