@efyqw1b4ngla you need to be more specific. Which tracks? Which corners? What wings are you using? What tire pressures?
The above is very vague, and there are plenty of corners in the game that are truly flat, and some that are almost flat.
Also in My Team career mode you have to consider that an undeveloped My Team car isn't going to handle very well because ... it's undeveloped. As you progress through the season and update the areo and chassis it'll will handle better. Eventually corner that require a slight lift in season 1 or 2 will be flat out in S3 or S4.