I know that no job is secure in this world, especially in the aviation world. But I guess the question is, am I in a dream world thinking I can make a career as an instructor, as well as supporting a family (some years down the line) and living a comfortable life style?
I'm not a pilot but I am 45 and was unfortunate enough not not 'go for it' when I was younger.
You can very easily turn your dream into reality - just take your obvious desire, couple it to your talent and work hard.
Good luck.