I have really low blood pressure and i faint when i get shots. could this be related?

A blessing --: Yes -- you are more likely to feel dizzy or faint with a low baseline blood pressure -- having said that, low blood pressure is generally more of a blessing than a concern -- just make sure that you take care of your health like anyone else with exercise and healthy lifestyle -.

Indirectly: I can't say for sure but either the pain of an injection or your watching it may cause what is called a vasovagal reaction. This reaction causes a drop in heart rate which in turn causes a drop in blood pressure which causes a decrease in blood flow to the brain. In your case potentially starting with low blood pressure you may not tolerate any further drop.