Step one of solving a problem is admitting there is one. You confess being a hypochondriac, the next step is to seek assistance in overcoming it. Soon, hopefully, there will be none left in your family. Everyone might agree that would be even more alright.
It's probably best. Two hypochondriacs in the same family might end up competing for the available sympathy.
Just the same be very careful. Hypochondria can be dangerous. I knew of a man who complained so often about imagined illnesses that when he finally came down with something serious neither his wife nor his doctor took him seriously.
Are you asking Is it alright that you are the only one .. Or ... That you are one at all?
Either way .. Being a hypochondriac is a compulsive behaviour. Any compulsive behaviour that can cause harm is a "bad"thing. This behaviour can create a false sense if doubt because anyone who knows you will never believe your claims .. Even if you ever have something to genuinely complain about.