White pine is terrible for burning so I’d not do firewood myself.
Lots of knots and compression wood with that grow type. Too many knots for anything structural and you may not even get enough clear spans without cracks at the compression lines to do a decent bench even.
You’ll get some serious warp and cupping even with it being kiln dried, air dry will be a bit of a nightmare. I think my milk would just chip something like this.
If it’s sentimental use I’d probably disc it to make rustic end tables or set them in dirt for a lawn path. The other option I can think of would be to rough it into 6x6 ish chunks up to 3 feet long. Chuck it in your attic for a year. Then learn wood carving and make a bird or something.