How many times have you gone to work and started working through the daily churn of things to do and got to end of teh day and felt you hadn’t achieved anything ?
If you spend a little time each day, planning the day out, be it in the form of jobs lists or use of a diary on Outlook, then you should find your day get easier.
By breaking the day up into sectors and knowing what you have to get done, then you will find that getting tasks complete is achievable and you will function better either individually or as part of a team.