I used to enjoyed summer a lot, but now I am an adult, the summer causes me a lot of headaches. I used to enjoyed summer a lot, but now I am an adult, the summer causes me a lot of headaches.

"But" is a connector, so normally goes in the middle of a sentence.

I used to enjoyed summer a lot.

I used to enjoyed summer a lot. I used to enjoy summer a lot.

But now I am an adult with a summer full of hedeaches. .

This sounds like you literally get a lot of headaches in the summer. You could also say "... a summer full of problems"

BI used to enjoyed summer a lot, but now I am an adult with a summer that has left me full of headeaches. I used to enjoyed summer a lot, but now I am an adult with a summer that has left me full of headaches.

For clarity! Try not to start a sentence with "but" as well.

But now I am an adult with a summer full of headeaches. But now I am an adult with a summer full of headaches.

I am a bit tired aboutof looking for a job every summer, about not knowing what is going to happen next school year with my life andwith my life in the next school year, and about worrying if I will have enough money to pay bills. I am a bit tired of looking for a job every summer, about not knowing what is going to happen with my life in the next school year, and about worrying if I will have enough money to pay bills.

Changes for to make the text flow more

I am a bit tired aboutof looking for a job every summer, and about not knowing what is going to happen with my life in the next school year with my life, and if I will have enough money to pay my bills. I am a bit tired of looking for a job every summer, and about not knowing what is going to happen with my life in the next school year, and if I will have enough money to pay my bills.

I am a bit tired aboutof looking for a job every summer, about; of not knowing what is going to happen next school year with my life and ifwith my life during the next school year; and of fretting over whether I will have enough money to pay the bills. I am a bit tired of looking for a job every summer; of not knowing what is going to happen with my life during the next school year; and of fretting over whether I will have enough money to pay the bills.

With longer phrases in a list, I would separate with semicolons. Changed the last phrase so that the grammar structure is consistent with the rest.

I am a bit tired aboutof looking for a job every summer, aboutnd not knowing what is going to happen next school year with my life and if I will have enough money to pay bills. I am a bit tired of looking for a job every summer, and not knowing what is going to happen next school year with my life and if I will have enough money to pay bills.

I am sorry withto the people reading this text, I really don't want to share bad energiesy with you, but I need to scream somewhere. I am sorry to the people reading this text, I really don't want to share bad energy with you, but I need to scream somewhere.

I am sorry with the people reading this text, I really don't want to share bad energies with you but I need to scream somewhere. I am sorry with the people reading this text, I really don't want to share bad energies with you but I need to scream somewhere.

Don't worry at all! I hope things are better for you soon :)

I am sorry with the peoplto those reading this text,. I really don't want to share bad energiesy with you, but I need to scream somewhere. I am sorry to those reading this text. I really don't want to share bad energy with you, but I need to scream somewhere.