There are many easy things you could do to improve your quality of life.  Some examples include:

* Getting more sleep each night
* Drinking water at a regular interval throughout the day
* Taking breaks during work or studying in order to stretch, stand up, move around, etc.
* Maintaining a clean living space
* Eating healthy foods
* Exercising regularly, even if only lightly (e.g., going for walks)

You may also find it helpful to organize your time better, make plans with friends/family members, or reduce stress in your life by talking about issues with those close to you.  If these changes don't help much on their own, then there may be other underlying problems that need addressing.  In this case, it might be worthwhile seeing a doctor or therapist who specializes in mental wellness.
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