Be thankful and grateful. Stay more positive than negative. Thrive in the good times and persevere through the tough ones. That person you pass may be having their worst day while you may be having your best. Do more good then harm. Put others first. Stop and help. Do the right thing. Live each day knowing that it could be your last. Keep your family and real friends close, and focus your energy on the people in your life that truly matter. Don't be envious. Changing the plan is okay. No one else can make you happy or complete. Embrace aging and the transition into new stages of development (Erikson). And lastly, give your self a break and take some credit for all that you've done and continue to do, and be alright with the person you are.
And of course, go fishing, just not today, the weather went to shit...