Does anyone know how to solve that my profile photo always goes sideways? Thanks in advance!
Digital photos can include data that tells another computer which way is up. It's called EXIF data.
Yours evidently did.
So it would appear correctly on your device, but sideways on any device which didn't use that data.

You can edit photos to change their orientation
.
Does anyone know how to solve that my profile photo always goes sideways? Thanks in advance!