I've had low platelets for at least 25 years, maybe longer, not even sure when it was first picked up, but it came to light in a random comment one time. It got me worried, but I did research and knew what to expect if the situation got worst - initially treatment would be two weeks of steroids, worst case would be removal of spleen. I have annual blood tests anyway, to check on cholesterol as it can be hereditary and my mum has been on meds for decades - so everything gets checked then. Diabetes only poked its head in last year.
Low platelets means you will bruise a lot easier - brush past something and voila - a bruise, scratch too hard and you bruise yourself, sometimes I just need to look at a corner and one appears. Also your blood takes a wee bit longer to coagulate - when I finger prick and it is taking its own sweet time to stop beading, I just pop it under cold running water, it helps to stop it. It is just a normal part of my life now that I deal with without a second thought. When I've been in hospital and they've had to put a canula in my arm, I just tell them I'm a bleeder so they don't get too concerned when they need to remove it again.
Hope this helps put your mind at rest.