Agnieszka wrote:
I don't tell others about my long term plans. Sometimes I tell them about short term ones, since I like when people know that I planed something and would be unhappy if I couldn't stick to it.

Noooo! People are happy when you planned sth and you can't do it! Except these plans that profit them. If you do sth for yourself or at least NEUTRAL for them, they only wait for your fail.
So when I'm not sure I can, I don't tell. I hate to be this worse one.
And I hate when I plan, I can, but something make it all impossible. Example: I planned to get language certificate, so I enrolled for the course, I was tested etc... but later I got a school timetable with lessons from morning to evening. So I had to give up language. And when somebody asks me
How about your language course? I reply
I had to give up because of lack of time and it sounds like
I'm too lazy.