As a child, yes. Now - obviously no.
I was scared as a child by facehuggers and chestbursters. Alien - 50/50, it didn't scare me like a terrifying space monster or blahblahblah. But just a normal predator animal, like anaconda, tigers, crocodile, ect.
That's why I created a thread in which I asked - should an Alien be scary? No. It's just an animal. With some intelligence. But animal. Obviously, The Thing and the Monster in a basket are much more terrible and more unpleasant than the Alien. At least the Alien cannot fit under the bed.