The vast majority people with structural heart defects will never get endocarditis, no matter what they do or don't do, so NO, you should not live in fear of getting endocarditis. Neglecting your dental health does not help matters, but all you can do now is to just suck it up, and do what needs to be done. If you think perhaps you should have a bigger dose of amoxil because of your body weight, then by all means, call the office of the doctor who prescribed it and double-check, but if the doctor doesn't see fit to adjust the dose, I would not worry about it. Your chances of getting bacterial endocarditis are low. What is important is that you not elevate your risk by walking around for years with a mouth full of infection. Get your dental care up to date, and you will be back to baseline risk, which is LOW. There are no nonexistent risks (anything can happen to anybody), but the risk of bacterial endocarditis is very low, even for you.
yes while waiting, i called a doctor and pharmacist about it; they said amoxil does not vary when it comes to weight and that there is no resistance to it meaning my chances of contracting endocarditis are practically nonexistent on them, it's mostly fear; I mean I just bled from my mouth earlier cause I cut myself with dental floss and was panicking about bacteria even though i bled many times before.
I'll get myself to the dentist in a hurry and remedy my health situation in order to live a normal life.
Best to go get the dental work done asap, before it messes up your head. Try not to obsess with worry