How do I overcome my fear of having a child with down syndrome?

I know it's not a nice thing to ask (that's why I'm posting anon), but time is coming for me and my wife to have a baby and I cannot be excited about it because I'm too scared of having a child with down syndrome.

It's nothing but a selfish feeling, I know a few people (some are family) that have a down syndrome son/daughter, and their lives revolve around them. They cannot go to social events, they cannot enjoy holidays, they can barely save any money... Is like their life is over.
And they live in constant fear that the child is going to escape, or hurt himself, or hurt others, or break something. Last month a down syndrome teenager visiting a relative in my wife's hospital threw her dog against the wall and killed it, you have to have a thousand eyes on them.

I don't want to live like that, I have no reason to believe I will, but just the fear that it could happen terrifies me. How can I overcome this fear? I tried talking with my cousin who has a child with this condition and I only felt worse afterwards.

I'm sorry if this question offends anyone.
How do I overcome my fear of having a child with down syndrome?
Post Opinion