My scarf

my scarf is getting big and I think I made a lot of mistakes this is my first time
I use a 11 needle and thick string I looped the whole need led help

Welcome to the forum!
It looks like a very nice start. You have too many sts however for the length of your needles. Did you start with that many sts or are you increasing the number of sts as you knit?
If you want a large number of sts, circular needles are best. They can accommodate the large number and you can knit back and forth on them in the same way as straight needles.

Here’s a long thread with many suggestions on the origin of extra sts in case this helps.