Never give up on a dream just because of the time it will take to accomplish it. The time will pass anyway.
Lessons to be learned:
What dream did you give up on today, yesterday or a long time ago?
What would your life be like if you would have accomplished your dream?
Would you live in the same house?
Would you have the same career?
Would you be less stressed and have more balance in your life?
However different your life would have been, remember this: Time passes anyways.
Do you still want to achieve this goal?
If yes, what specific action can you take right now to start you moving again in this direction?
Do you need to acquire new knowledge in order to achieve your training?