All of us can claim to be busy. Whether or not you can manage to fit in everything you want to do can vary according to many things, including work loads, other commitments, children, motivation, health, concentration spans, etc.
I'm a very firm believer in:
I can do anything I want to do, if I want to do it. I've proved that over and over.
I'm retired now, but my day has never been busier, so I still need to schedule things. I want to briefly relate how I managed to fir in everything about 40 years ago. I'm not boasting here. I'm a pretty ordinary fellow with an average set of skills, and I just want to demonstrate that we can often fit in more than we think.
At that time, I was married with 3 school-age children and a toddler at home. I was the sole income earner. I had a full-time job in a senior management position in a large university library. That took more than 40 hours each week. Concurrently, as a part-time student I was studying law at another university a few miles away. That involved the usual lectures, tutorials, assignments, etc. Then of course there were the usual family commitments. So, I guess you'll understand when I say I was pretty busy.
My day started at 6AM. Work from 8.30-5.00. Study from 6-9pm; assignments and reading 9pm-1am. Except for emergencies that was rigid Mon-Fri. Saturday and Sunday morning I devoted totally to family activities. Sunday afternoon was mine -- I relaxed by playing lawn bowls from 1-6.
When I look back at that schedule, I marvel at how I survived the 8 years I stuck to it. It was probably hard at the time, and I probably hated it. Honestly, I remember none of the bad things. Interesting, isn't it.
Strict organisation helped me, perhaps it might help you.