[willstepp]

Taoism has good advice for this kind of situation. You have to come to the realization that you can never control the outcomes of what you do in life. If you base your happiness on outcomes alone then you are setting yourself up to be disappointed in the long run. Find value in doing good work for its own sake, learning skills to be applied in other endeavors, things like that. 30 is young, despite what you may think.

Fill your bowl to the brim and it will spill. Keep sharpening your knife and it will blunt. Chase after money and security and your heart will never unclench. Care about people's approval and you will be their prisoner.

Do your work, then let go. The only path to serenity.