This is exactly how I feel sometimes. GT Sport doesn't give you much to fall back on when you get sick of online racing. If you're not enjoying it, play something else you like. Then again you can't win them all; it just isn't possible. Sadly, that's how things go when you compete in a race, or any competitive event. It's learning from those bad days and figuring out what went wrong that defines who you are. Trust me, I've had some terrible lows in my time, but this only motivates me to improve further.