What can I do about my listlessness to work?

Have a wonderful Sunday afternoon.

Before the question starts, a little bit of information about me:

-Age: 27

-Completed my retraining two weeks ago and has been active in the professional world for a week.

-My job is fun and the working atmosphere with my colleagues is wonderful.

-I have a permanent contract and am employed full-time. = 40h week.
- I'm still in the trial period for 6 months.

My problem is kind of hard to explain. On my first day, I was fully motivated and happy. Did the internship there during my retraining and am glad that I was taken on. But after my first day I didn't feel like it anymore. Why? Because I just can't imagine doing this job for several years. Every day from 8 a.m. To 5 p.m. IF you finish work on time. I'm at home around 5: 30-6: 00 p.m. Depending on the end of the day, make myself something to eat, lie down on the couch, watch YouTube or Netflix and between 8 a.m. And 9 a.m. I go to sleep. It has been going on for a week now.
Do you know that when you have such a strange feeling in your stomach, e.g. Before an exam or reverence? I feel the same way every day, just because I don't feel like the next day. Really strange to explain.
Have you experienced something like this or already? What could be the reason and how did you "fix" it? Friends and family simply say: "Welcome to the world of work." But that can't be right?

Do you know that when you have such a strange feeling in your stomach, e.g. Before an exam or reverence?

Do you have to introduce something every day?

.is the job right for you?

Um, no, I don't know anything like that, at least not during a normal working week.

Every day has new challenges, new problems, new solutions.

I enjoy my job, it challenges me.

That's pretty normal. Such a start in a new professional phase is getting used to, which is also associated with an increased level of stress and a lot of worry. You are no longer the retrainer with a little "puppy protection", similar to trainees, but a paid specialist. This goes hand in hand with a different demand for the quality and quantity of your work, which you - at least subconsciously - probably also feel. That can be hosing at first!

And yes, the bottom line is that a full-time position actually leaves very little room for free time (that's why I'm also an absolute fan of part-time and especially 4-day weeks.

But get rid of the thought that it has to stay that way "forever"! It is the beginning. Gain 1-2 years of work experience this way. Then you can rethink, negotiate, and look around. For example in the direction of a reduction in hours for a better work-life balance. Or more interesting, more responsible tasks for a more varied content, advancement and so on. Or maybe a completely different job in a completely different area, where you can really realize yourself and "let off steam"?

That's exactly what everyone told me too. I should first gain experience.

It really is, and you shouldn't underestimate how much you can really learn if you work "really" in the job.

I do not understand. The job is fun and the colleagues are nice: you should really like to go there.