The feeling that you were happy earlier and that the responsibilities and duties are pulling you down will end up burning you faster within. Instead shift the goal posts. Try splitting those activities into parts (if they can be), if not think of things which resemble the same but more achievable.

That will keep you cheered up and infuse energy. With positive energy within you can then work towards doing or discovering those things that you want to now. Spending a couple of hours with yourself may help.
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One life to live, live it to the fullest.