Short term no, long term yes. It's uncomfortable now because you're not used to it. As you develop the back muscles necessary for good posture, you'll feel better in the long run as it'll take pressure off your spine.
This is so true. One day a couple years ago I decided I would work through the pain of sitting up straight. I think it only took around 2-3 weeks of sitting like this for it to become comfortable.
When I sit up straight my back no longer makes contact with the chair, adding much more stress. Maybe there's something wrong with my back :/
> Maybe there's something wrong with my back :/
Could be the chair too!
A lot of chairs give poor support for proper posture. Aerons are very good about that in my experience; something with the same profile will probably do you well.
Lean the chair back slightly. Adjust the lumbar support (I hope you have one) to support your lower back.
This works for me at me desk and in my vehicle.
Get a lumbar roll. Your upper back shouldn't be in contact with anything.
It's more comfy and it lets you breathe more easily, but you need the muscles for it. It's only a relaxed neutral position if the muscles at the back pull just as much as those at the front.
It is more comfortable, after you establish the discipline. Getting there takes some practice, which is probably why people slouch.