I know exactly what you mean and relate 100%.
it’s as though during winter, you have permission to retreat inside and become a bit of a homebody / hermit. The longer evenings, milder air, reawakening of the natural world - for me - is profoundly unsettling.
I think it’s like having a comforting duvet whipped off you. It’s a more sociable season. More pressure / expectation to be outside, ‘doing things’, seeing people, etc.
Some years it doesn’t trouble me quite as much, but if I’m even slightly depressed I find it very difficult. This year it’s going to get to me, I can already tell.
interestingly, suicide rates peak in April, while they are usually quite low in the depths of winter, so there’s something to it. And as TS Elliott said,
April is the cruellest month, breeding
Lilacs out of the dead land, mixing
Memory and desire, stirring
Dull roots with spring rain.
Winter kept us warm, covering
Earth in forgetful snow, feeding
A little life with dried tubers.