I have wondered if I may be dyslexic for a while. I always switch things like saying "brain mand" (main brand) or "cass the piches" (pass the chips). I also almost alswya with r's with l's like when i say "lettel" (letter) or "bettel" (better). It's annoying because it's impossible to present projects with my face becoming rder and my leg violently tiwching from anxoiusness of screwing up.
Get an assessment done.
There are free screening tools online - I found the one at Genius Within was good. But I'm sure there are others.
You don't say how old you are. If you work ask yr HR department to arrange a Workbased Assessment. These can be funded by Access to Work. HR will know.
If you are at school/college talk to your tutor and your parents.
Dyslexia or SLD are too hard to diagnose unless the problem is severe. The most basic symptoms of dyslexia is finding difficulty with writing and spelling, and often with reading and working with numbers. A dyslexic person may confuse between left and right and may also have problems putting things in order with instructions.