Is it mean to discourage people?

I gave some unsolicited career advice recently on a facebook post (sorry) and realize that is not the best idea. But lately my advice on the same topic has been sought after a couple times.

In general, I think my career path was a bad idea, and it is not immediately apparent to people outside of it what the risks are (I may change my mind in 4–6 years if I end up with a good job but am not optimistic). It is really only a good idea if you hate money, job security, and living close to people you care about, and really enjoy interacting with people with personality disorders, and having your ego ripped to shreds on a regular basis.

I come in contact with bright-eyed undergraduates on a regular basis who want to know how I got where I am and ask for my advice on how to get there. I feel like it’s rude to tell them JUST DON’T DO IT, and it usually comes across as suggesting that they can’t hack it, which is in no way what I’m getting at.

Am I being a dick if I tell them the reality of how much it sucks? Are we supposed to keep telling people to follow their dreams no matter what?