Recently realised a few people around me have been getting really disillusioned with life. Like how they feel the things they are doing is meaningless, then they get all sad. However, I feel that life is great. It's this meaningless moments in life that lets you identify what is meaningful and what is not. That's why I say, be thankful for these moments. Do not lament and feel sad for yourself. Instead, be happy that you have this moment in life to motivate you, to spur you on to do greater things in the future.
Everything happens for a reason, so find the reason for why you feel a certain way, then use it to your advantage.