Both hands are so useless at playing guitar now that maybe it makes no difference if you use a left or right handed guitar. Interestingly enough, the most complicated things are done with the left hand, and most people do it with the left hand even tho the majority of people are right handed.

There’s nothing wrong in using tabs, although it’s better to have knowledge of standard music notation on a music sheet. Better to know both.

As for the chords, it sounds just like expected from a novice. Chords take some time to learn and more time to master. Unless your guitar is super big and/or you have very small hands, you should be fine