Is it normal that i'm afraid of aliens?

Kind of dumb. Yeah. As usual. Well then, let's fear aliens.
(rolling eyes)

Well, i believe in intelligent life forms from other planets. and i believe there are more than we seem to realize. However, these are just crack pot theories that really interest me because they make sense. Doesn't mean they're true, just make some sense.

I'm afraid of them too, especially at night!

I'm interested in the cosmos, but every time I look things like that up, I always get paranoid later in the day. I just was on a site looking up the universe, than I started looking up bio-engineered humans and some alien cultures. I know I'm gonna be even more paranoid tonight:/

Why curiosity, why?!

Did they ever give you any reason to believe you are one of their major concerns? Strange phenomenons leading you to the conclusion they are trying to establish contact?
Well then what's there to be afraid of? The only thing we should be scared of are people who haven't got any good intentions or who's intentions are clearly unclear.
Aliens do not exist and if they do they have way more important things to be thinking about than conquering a shitty planet like earth. And by the way, what is it you did making you think they would be wanting to hurt you?
It is just the fantasies of a demented bunch of movies directors. Of course you get frightened, these movies and tales have been made with that purpose in mind.
I suggest you start watching some documentaries on the subjects instead of movies. You'll find out that:
number one:speed of light space travel is impossible. It would take an alien species from the nearby inhabited planet light years to reach earth. If there were any.
Number two: it is likely there is no life form living a stage of technological development like our own. We became capable of building rocketa and shuttles in relatively short time, but that doesn't mean that short time, matches the short time of that other planet.
When we look at the sky what we are seeing is light reflecting from the surface of the planets we look at using our telescopes. That light takes years or even hundred of years to reach the earth, so it is basically like, in a way,we are looking back in time, we are not seeing what's there right now. The now of that planet or solar system. It's delayed imagery. We will see what's there now later. A year from now. A hundred years from now, and so forth. According to the distance the photons or other radiations have to travel before being caught by the lenses of our telescopes. Even the sunlight doesn't just pop up here. It has to travel a long way before hitting our planet.

It's called xenophobia, the fear of strangers. I think this is a very rational fear to have because it contains a degree of the unknown, which some of us would associate with fear.