There is no peace or happiness in our worldy life. Circumstances create turmoil and annoyance.
Everyone is hankering for happiness because by nature we are happy : anandamayo ‘bhyasat (Vedanta-sutra 1.1.12). As spirit souls we are naturally happy, blissful.
Joy can only be experienced when we offer our love to Krishna.
The happiness in serving is the happiness that material nature cannot impede because we can always serve in some way or the other.