Let this table serve as one of life's lessons regarding welding.
Yea, there are probably a few on here that could "straighten" that table out, but it still isn't going to be right.
You'll find that when a project isn't "started correctly", it seldom comes out well. Plus, you're fighting yourself at every turn. When a phase of a project (say attaching the legs) doesn't go as you expect, STOP, fix the error and then proceed. Framing square, heavy clamps, and lots of good tacks are a welder's best friends.
Don't feel too bad. We've all probably chucked our fair share of "opps" in the dumpster. The longer you stay at it (welding), the fewer trips you'll have to make (dumpster).