For all the people without race bikes and racing clothes, how much does riding against head win affects you?

I have started to ride my cross bike regularly for about 2 months, and I cannot adjust myself mentally to the wind.

20-30km/h already is sufficient to slow me down significantly and tiring me down fast if I fight against it.
Mentally it's worse than riding a slope, because it's a fucking flat road, but you feel like you are tucked into the ground and barely move forward.