Yesterday ım learned ı didint take anythat I didn't get into unıiversity.

The original sentence doesn't make sense in English (didn't take any university). Perhaps you meant that you did not get accepted into university, in which case you can use this edit

ItsThat mean ıs I have to study one more year for the Türkiye university exam.

Actually, its makes me really sad and nervous ı can, and I couldn't do anything yesterday from think all of thinkbecause all of my thoughts.

Can't do anything = present tense
Couldn't do anything = in the past, yesterday

The things that you think are "thoughts"

I was thinkeding to go to another abroad üuniversity abroad, but I probably i cant takecouldn't get a visa f a. Also, euros and dollar iss are expensive o. One euro is more than 40 lira i. I am not rich at all axtually im not rich any i; I have no money, actually.

Thinking about something = a hypothetical situation, so you would use "couldn't" instead of "can't"
Edited the end here to sound more natural

Also iI am not sucsessfula strong student at all im a normal student, either. I'm average, and that makes my chances of studying abroad even more impossbleless likely.

When listing additional negatives, you can use "either" which helps to avoid repeating "also" too much.
"Impossible" is already at an extreme, the chances are 0%. Therefore, something can't be "more" impossible.

ThisOver the summer i, I was hopefully i was try to about learned eing English , i. I was improveing myself, i was learned and learning about other cultures .

"This summer" is more about the summer to come, for future activities. You are talking about the past, things that have already been done so far in summer, so "over the summer" fits better

Not the travieling i, I was just reading and watch theing videos.

Speaking about generalities (traveling, videos), you don't need "the"

My allAll my hopes are gone inow. I don't want to do anything.

This is not the end of the world i, I know also i. Also, I don't want to findmake excuses for the not working, like unseuccessful people but i dondo, but I am not doing it on purpose.

I'm not sad only for me actually ımjust sad for myself. Actually, I was prepared for this result i. I was already thinking iI would have to study again , (but other students had to go to universities with lower scorest than their exam results. ?)

I don't understand this part in parentheses, but I understand your point that you feel not only sad for yourself but for other students who got lower scores than they wanted.

I will livhave the same thinkoughts and i scare of all thinkfears.

Having a scary thought can be described as having a fear.