I am a lefty too! I learned to do things right handed. Used right handed scissors upside down etc. Then I got left handed scissors and had to learn all over again! I have left handed scissors and a rotary cutter that you just reverse the blade.
When I get a pattern that has illustrations on how to cut up a fat quarter, for example, I have to reverse it in my mind to be able to cut it out without going through some interesting contortions! I learned to crochet by using a book that had drawing of the hands doing the stitches and placing it in front of a mirror! Then followed the mirror image to do the stitches.
Don't give up you will find a way that works for you.