So school started for somea few days ago now, and I'm still feeling a bit awkward withabout my english .

This year I will have to do manya lot of essays and writting in English and I have exams in October and, so I'm feeling so stressed.

Even when I try to practice and master my English aI feel so overwhelmed and lost .

I don't know how to start and what to write, and it really makes me worry a lot .

Write about what you're interested in! It makes it easier and more fun.

Although I have tried to write things down , I'm making a lot of mistakes , and the other people in my class are so talented and they have a lot of ideas and this makes me feel even more uncomfortable with my English .

I hope that I will progress soon .

So school started for somea couple of days ago (now) and I'm still feeling a bit awkward withabout my english .

On peut le dire sans ou avec "now", mais je recommenderais de ne pas l'utiliser.

This year, I will have to do many essays and a lot of writting in English and I have exams in October and. I'm feeling so stressed.

On ne peut pas dire "many writing", je l'ai remplacé avec "a lot of writing".
Il y'a trop de "and" donc je l'ai fait en 2 phrases (grammaticalement c'est pas si grave, mais c'est mieux ne pas utiliser "and" plus qu'une fois dans la même phrase).

Even wWhen I try to practice and master my English a, I feel so overwhelmed and lost .

On peut dire "practice my English", mais pas "master my English" (c'est juste "master English"), donc j'ai supprimé "my".
"Even" n'est pas nécessaire, il n'a pas de sens. Ce n'est pas en dépit de quelque chose.

I don't know how to start and what to write, it really makes me worry a lot .

J'ai juste ajouté une virgule pour séparer les deux parties de la phrase.

So school started for somea few days nowago and I'm still feeling a bit awkward with my english .

'for some days now' would be used in perfect continuous tense (I *had* been do-*ing* something for a few days now)
You refer to a single completed action in the past, so speak about it as if it has already happened.

This year I will have to dowrite many essays and other pieces of writting in English, and I have exams in October, and I'm feeling so stressed.

'write' is the better verb here. You need to clarify what kinds of 'writing' you need to write, maybe other pieces. Maybe a couple of commas would help as well. You've got this!

Even when I try to practice and master my English aI feel so overwhelmed and lost .

This was really good apart from the 'a' instead of I.

I don't know how to start and what to write it really makes me worry a lot .

Try looking in the prompts section of LangCorrect, they have some stimulus you can write from.

Although I have tried to write things down , I'm making a lot of mistakes , and the other people in my class are so talented and they have a lot of ideas and this makes me feel even more uncomfortable with my English .

No need for spaces BEFORE pieces of punctuation, but continue to put them AFTER those pieces of punctuation.