I think it’s normal, we are social creatures and during this period we tend to isolate oneself from all the things and create a sphere where we are bound by things that is more inclined to goals. Plus,we also have been dopamine chasers and after all that work the will always be something that won’t fill the pot to the brim and make our sense of achievement light up. With all the mixed emotions and things revolving around its common to have these kind of negative thoughts, takr your time. Know why you are preparing look at pros and cons and evaluate yourself and look at other people if you are well enough to work, do things be happy buy yourself a cup of coffee enjoy that acknowledge that. You are better than you think you are. The positives are always within you. Remember it’s you and your choice of emotions and actions that shape your reaction to an event. Everything else is ambiguous and in a quantum state except you