Soloing itself will build your confidence way up, because at the end of the flight...there is no doubt, it was all you. Enjoy it, my first solo fostered a love of flying alone.

I also have problems with landing.... If there is a "must" I have to do it, I am stressed because I over-concentrate, when I think it's a fun flight and doing it all together with the instructor, it goes super good :-I

What's there to be over-stressed about. You have to listen to your instructor. The good approach is the key to success. After that, it's looking at the numbers, then looking down the runway. You have heard all these things before. Just trust the process.

My CFI is a former army pilot. however its more difficult, like evrything is need to be much more "perfect" as I have tried with other CFI-s also...I prefer this way... it's harder to learn but in the end the result is better.
But I start to stress a bit on final like "oh, I need to do it perfect" because I am happy when my CFI says it was a really good landing. But sometimes he says the opposite :P

There is no perfect flight. There are safe flights, but no perfect ones. If this is "difficult", and you've been through it with other CFI's, and still not done a solo flight, you may need a talk with Jesus in the mirror on why you really want to do this. You also need to do the ground work as well. Isn't it for every 1 hour of flight, you should be doing 4 hours of ground study. Just a suggestion. This isn't a cheap thing you're doing here. So, take it serious, don't screw off and get it done...unless you have an unlimited budget and you don't want it to go well..

You should reconsider flying.....if stress comes this easily to you, it’s only a matter of time until your inability to manage pressure and stress bites you.

I think people are diferent. some needs ten hours of flying, and then the others need twenty hours or thirty our to do solo. Just need to practice, and fly alone when you feel safe alone.

When I was very young, just enter to adulthood and first time drive a car "solo" without my father, I was really really stressed. There were weeks before, we train and train, and I have said no, I am not able to go to traffic.
(However I liked to drive around the village and at the forest car road, were we were living, in a pretty remote area).