Thank you for sharing about these concerns of yours. I appreciate the way you are able to organize your thoughts and communicate them, as I see in the way you have drafted your post.
I hear that you find yourself doubting your capabilities of getting some important things done daily and you end up procrastinating? This seems to be bothering you and you'd like to do something about it, yea. You also mentioned in the third point that a part of you believes that you will somehow be able to manage. Well, this could be a good place to work from - a positive voice from within you.
Now, self doubt within us could be there for one of two reasons--
One, when we are actually able to meet realistic expectations, but somehow we believe that we cannot perform or deliver, and this negative self belief (and not the lack of capability) is what gets in the way of us actually meeting the expectations.
Two, we are faced with such high or unrealistic expectations that even though we try and deliver to our best, we find ourselves falling short in some way (because of the unrealistically demanding nature of what is expected from us) and hence we begin to think that it is we who are at fault, who lack capability.
I would invite you to think about which of these might be happening with you.
If you are able to relate to the first situation more, then what might help for you is to look into where you lack of self worth or self efficacy (belief in your own capacity) comes from and to build healthy self esteem.
If you are able to relate to the second situation more, then what might be more helpful is to check what is being expected of you. What are these goals or targets that you are trying to meet and how realistic are they? And whom are these expectations coming from? And then finding ways to build more realistic expectations that you could work towards.
If you find that it could be a combination of the two for you, then you could approach it also that way. To maybe begin working on your self esteem on one side, by say, acknowledging yourself for things you are indeed able to do, building positive self concept, and at the same time, working towards realistic goals so that you have a chance of accomplishing them and that in turn fuels positivity to how you view yourself
I hope that made sense?
Procrastination could be a sign of lack of interest, or an underlying issue that makes it difficult to engage with the task. Maybe the self doubt in itself is somehow related to the procrastination (like you've begun sharing) and this could be turning into a cycle which might look as follows:-
(Underlying issue) Self doubt--> (Thought/Belief) "I can't deliver" --> (Feeling) fear of failure --> (Behavior) Put away the task or held back from engaging in it i.e. procrastinate --> (Consequence) task delivery gets affected--> again back to self doubt.
Hope this gives you some direction in understanding what might be happening with you, to check if this is what it is, or maybe something else, and accordingly see where you would like to focus on working to make necessary changes for the better.
I would also encourage you to connect with an expert on the platform for a session, if you'd like more focused attention in figuring out any of your concerns further or working towards resolving them.