Viva, I'm so happy to hear that you aren't allowing youself to dwell and pity yourself.
Just take it one day at a time, and do just what you are doing...keep busy, stay active. Of course, allow yourself to grieve too - that is important.
I have to disagree with what someone said, that personalities don't change after 16 or 17 years old. I am NOT that same person at all!! In fact, I've changed a lot in just the last couple of years. Sure, some of the basics remain - I'm honest sometimes to a fault, I have some of the same interests as I always have - but there is more different about me now at age 31 than the same when I was 16. But I really believe that when I finally found myself, my real self, was when I was single and by myself in the real world. I didn't have anyone else to answer to, so I was able to figure out what I wanted - whether that was what to do on a Friday night or what I wanted to do with my life. When you are in a relationship for a long time, it is so easy for you to take on personality traits of the other person. That is true with friends as well as significant others.
Once you get to know and like yourself, by youself, then you can truly be in a mutually respectful relationship. And when your personality changes as you mature, grow old, grow up, the person you are with can still respect you as they also mature, grow old, grow up. Just my opinion, though.