Trying to weld, I’m terrible!

Trying to weld in some floor patches in my 69’ Dart. Using a MillerMatic 251 MIG welder with .030” wire. Can’t get a good weld for the life of me (as you can see). Been trying the whole day. I suck. Blowing holes through the floor. Turn the voltage and speed down and now the weld just piles up in ugly blobs (and still blow holes here and there). Ended up just grinding them down to see what I was doing. YouTubers make it look so easy, no idea what I’m doing wrong.
Would these ugly stitch welds hold though?
Any help is greatly appreciated. I’m so frustrated I want to give up… :-(

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