I have low blood pressure
Hey, lucky you ! Just be grateful it's not high, like it is for so many of us ! I have to take two pills each day just to keep normal.
A useful rule of thumb is that IN A NON-TRAUMA SITUATION (that is very important) , and in the absence of troublesome symptoms, such as fainting or dizziness, then blood pressure cannot really be too low. Quite often in the consulting room here my digital BP monitor on a slim fit youngster registers systolic of less than 100. eg 95 / 52 . That's perfectly OK, so long as there are no symptoms.
VERY DIFFERENT in a trauma situation, when there might possibly be concealed haemorrhage, and the low BP would then be an absolutely cardinal sign of surgical shock. Not an everyday problem.
My advice is forget it, and get on with learning to fly !
Happy Landings !