Is it good to have your future planned out?

I haven't posted much lately so I'd like to apologise. I'm sorry.
It's been a busy time.

I've been thinking about the future lately, about what I want to do, where I want to go and all of the adventures I want to go on. But is it okay to have your whole life planned out?
I know some people who know exactly what they want to do and exactly what time they want to do things. Personally, I don't think that's right,
yes I plan for the future, however, I only plan the things that I have to plan like which university I want to go to, which courses I want to take and which places I want to go to. But never have I thought about who I want to marry and how many kids I want to have or even what job I would like to be involved in.
I've learned that nothing goes according to plan in this life, you can plan something for so long but something happens that just completely destroys everything you have ever planned for and suddenly you are left having to plan something completely new.

So here's just a quick tip; don't plan out your full future because you never know what lies ahead of you and what your future may hold. You don't always live the life you expected yourself to.