It's never too late to start something new. Although more than half of the year has passed, I don't think it's too late to set new goals for yourself. What are you gonna do, anyway? Put it off until next year? Just remember that whatever new and inspiring ideas you have now, you better act on it fast, to reap its rewards earlier on. Of course, this doesn't necessarily apply to everything.
Think about it. I'm sure you'll know what to do. :)