Do i have an iron deficiency?

Im 17 years old and since i was little i always get really bad mouth ulcers. Some of them last up to 2 weeks and after that one is gone, another one will pop up a week or so later. Ive also noticed that im feeling really sluggish throughout the day, even when i have a good nights sleep. My diet consists of very little fruit and veg simply because i hate the taste of it but i do try eating healthy foods like salmon and lots of meat. Do all the problems im having mean ive got an iron deficiency or is it just really bad luck? Plus, what are the best foods to eat to help if i do have a deficiency. Sorry this is long but thanks for the help.