if you have lower tire pressure than normal you would have more traction on the road, which means less wobble or wander.

 

So what else could it be? Or am i just going crazy hahaha?

 

If you have pressure so low that the tire is really dragging, that can could cause some instability... more like shifting to outward of a turn... but then you should pull over immediately :/
Check wheel alignment (rear tire being put on crooked)

 

any easy/quick way to check that? how would i make sure my handle bars are straight though?