You're doing a lot of things and that's why you feel so busy. You schedule is messed up, there are lot of activities in your life that are completely just a waste of time and energy. That's why you always feel like your energy was easily depleted. You don't mind if your energy goes to useless activities like watching TV, playing stupid games, gossiping, talking about the people you hate, joining activities that you don't even like, spending your time with the wrong people. It's better to just rest and do nothing than to spend your time taking actions that will only make your system weaker. You have to conserve your energy to do more important things. The reason why you can't do a lot of things is not because you don't have enough time, it's because you're wasting a lot of time for nonsense activities. It's draining you, it's pushing you away from progress.
Even if you're just thinking about negative thoughts, it's also draining your energy, it's making you powerless. Just choose to never think or put your mind on neutral to avoid draining your energy. Because negative thoughts is so poisonous, the more you entertain it the more your body will become weak, you will never take actions anymore, that negativity will control you and will immobilize you, it will scare you, it will stop you, you will become a slave of it. Just rest if you will never do something good because at least you're gaining more energy from it. When I say rest just stay neutral and plain, don't do anything like playing video games or using your cellphone and hanging with social media all day long. Just close your eyes and sleep if you can, or at least meditate.
If you can just focus your mind and body to more productive and meaningful things then you will have a much better life. It's easy to have money if you will focus on getting money, it's easier to become healthy if you will focus on taking care of your body. The reason why you're failing is because you're doing a lot of things, you're too busy everyday thinking about problems that's not even connected to your journey or growth. Be mindful of the things that you do, be mindful of the thoughts that you think. It's simply about disciplining yourself and focusing on the things that really matters, if something will not make you grow then get rid of it, throw it away off the window, get rid of it as fast as you can.
Don't tire yourself out, it's not the difficult tasks that makes you tired... it's yourself, you're making yourself exhausted because you're entertaining too much useless activities. You love a form of entertainment that is not helping you to make progress.
You will become very unproductive if your mind is stressed, you will become slow and weak if you're thinking too much and if there's a lot of things going on with your life, you have to trim your activities, you have to prioritize the things that makes you better. If something is not making you improve then why the hell will you give some time for it? throw it away the window, get rid of it. You know what's better for you, you know what will work or not.