To me, it sounds somewhat like hyper focusing. Are you familiar with ADHD or ASD?

It's normal. I like to think human brains are optimized like a single-core CPU, if you want to make a computer analogy. If you multitask, you're likely to be unsatisfied on the parallel tasks you're doing.

Can't say if its "normal" or not but I'm exactly the same. It sucks sometimes cause I want to work on multiple things. Developing a project, learning a instrument, learning a new language, training cardio. But I seem to only have time for one at a time. Because I'll put soo much time into that one. Whichever one is most interesting at the time.

At the same time though I kind of think its a good thing cause when I'm interested in something I can have a lot of fun and make a lot of progress fast.

But yeah if I find a new TV show or game I have to completely finish it before I can get back to being productive.

Balancing multiple interests and projects is not easy. Seems to me you need some balance.

Just some ideas that help me get stuff done.

Prioritizing. Identify which project or task is most urgent or important to you right now. Focus on that one first before moving on to the next.

Realistic Goals. Break down your larger projects into smaller, manageable tasks. This can make them feel less daunting and help you make more steady progress instead of leaving them entirely. Also be realistic in how many projects you can handle.

Scheduling. Allocate/schedule specific time blocks for each activity. For example, dedicate certain hours of the day to game development, writing, and leisure activities. This keeps one organised and helps progress on all fronts.

Limit Distractions. If you're easily distracted, fix that. Minimize interruptions during your dedicated work times. Stay focused.

Otherwise take regular breaks, don't expect perfection of yourself and share your tasks with someone to help you stay balanced.

If it's extreme, consider getting professional support. No shame in that. Quite the opposite.

Edit: spelling

ADHD or autism. See a therapist for advice.

I don't know about "normal" (I imagine it depends on how you define "normal") but I do that and I think it's fairly common too. Much easier to do 1 thing at a time than many.

https://en.m.wikipedia.org/wiki/Hyperfocus ?

Normal to me but keeping up with regular day to day, week to week, month to month, year to year is hard for me.