Originally posted by Repaer:

Yea but I don't want to use boat, that is the point

It's a big world out there. Unless you used a specialized seed to spawn your world it's not super likely that you'll be able to reach every biome/boss/resource without travelling to another continent. Boats gonna happen.

Originally posted by Repaer:

what happens if I die at sea?

Your tombstone will be floating where you died, you can still go back and get that. If you somehow managed to destroy your boat your cargo will be gone.

If that's all too big and scary for you there are mods available for this game, and teleporting ore has been a popular one since release.