Voting makes you happy!
Or as the classic research paper on the subject puts it rather more simply:
A cross-regional econometric analysis suggests that institutional factors in the form of direct democracy (via initiatives and referenda) and of federal structure (local autonomy) systematically and sizeably raise self-reported individual well-being. This positive effect can be attributed to political outcomes closer to voters’ preferences, as well as to the procedural utility of political participation.
(Frey, Bruno S. and Stutzer, Alois ‘Happiness, Economy and Institutions’ 2000)
This study was done in Switzerland where the level of democratic activity differs from canton to canton (regions). It therefore lends itself well to looking at correlations between levels of happiness and participation in democratic processes.
A key part of the findings was that voting makes you happier, whether the outcome or person you voted for wins or not.
So, no matter who you vote for, make sure you vote!