Happy birthday! If you made it this far, your life expectancy is a lot higher now. That means you should probably start thinking longer term -- whereas in your late teens you thought about college, in college you thought about your twenties, and in your twenties you were busy with your career, in your thirties you should start thinking about retirement.

The two items that are going to dominate your retirement are your finances and your health. If any one of these suffers, the other will as well. So start saving if you haven't already, or increase your savings otherwise. Be mindful what you put in your body, not only drugs and alcohol but food as well. Stop "trying" to exercise, do both aerobic and anaerobic exercises, consistently.

That said: you're not done with life. So keep learning, keep growing, keep enjoying every day. Set goals and work on them.