What happens when your life goal changes?

I was just wondering about this question. What happens if everything you did for the whole life was after a goal and after that your mind just changed? Like I've been wanting to become a doctor but when I got to poly, is somehow changed, or.. perhaps I came to realize that I wouldn't be happy being one? I started to wonder and explore alternatives and decided that medicine isn't what I want..

Well, I didn't exactly felt lost. But I was confused.... I didn't want to waste the time and effort I've put in and.. I don't know... It felt like... I shouldn't waste it but I don't think I want to continue and just do something that I'm no longer that into anymore...

My new life goal seemed like a spark to my current life. It felt like a motivation to want to work hard. Perhaps previous goal did have that effect but it didn't sustained. Not exactly didn't but the desire kind of go off after I got distracted and realized that life could be much simpler. Now I envision a relaxing life.. the kind of life where I would wake up with the sea in front of me and I could spend my time in my little cafe serving coffee that the aroma alone could get me drunk.

But I guess this type of life isn't practical in Singapore and everything is just so difficult. I'm just bored. >< Time to get back to reality. LOVES ^^