[petercooper]

Be comfortable being you, and take steps to be "more you". Acting in an unnatural way to fit social conventions is a lot of work and often a waste of time unless it's to achieve a short-term goal (e.g. get funding, land a customer, find a partner).

Find time to tackle those interesting problems, even if it's outside of a formal academic environment. Get blogging, vlogging, maybe socialize online more if you're short of time. Doing the things you naturally want to do will re-energize you significantly as an INT* (I'm an INTJ) - if that's work, SO BE IT and ignore anyone who complains about being a "workaholic".

Also, if you are not a people person, don't feel pressured to become one. I have felt this pressure for years and am finally starting to realize it's "OK" for me to prefer my own company. Contrary to many other comments here, you do not necessarily have to force yourself out to social events if you know they ultimately don't work for you (but if they do, go for it!)

[kenbolton]

The first paragraph, I call this "integrity"! Maintain integrity.