Worrying about what may or may not happen in the future spoils your enjoyment of the present moment. Focus your mind on the good things happening right now. It could be something as simple as the sun shining or the cool breeze blowing through your hair. There is so much joy to be felt in each moment. Worries and anxiety are simply fear of the future. Live in the present and take things as they come. - I have to tell myself this CONSTANTLY so if you're an overthinker like myself, then focus on the now.
Also, find a type of meditation that works for you, that will help too!