What are the dangers of being underweight?

So I'm a very skinny dude weighing at 115 pounds, has a very fast metabolism, and perfectly healthy (so says the doctor). However, when I looked online, I noticed that I'm much more vulnerable than most people. In other words, I have a higher chances of getting heart disease (and other diseases) etc...Do you think I'll be fine? I'm not anorexic, just underweight by 15-20 pounds, (supplement information about me)I asked the doctor if could do a blood test (to see if anything is wrong) and the results were that my cells regenerate much quicker than the average person does, meaning that I heal slightly faster than usual. Say if I were to get a small cut on my hand, it would take a normal average healthy individual a week or more to completely heal, and for me (the doctor says) it will take only a few days to a little more.

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You have not furnished your height. Hence your body mass index could not be calculated. However your weight may be normal if your height is less than 5'6".Underweight can also be a primary causative condition. Severely underweight individuals may have poor physical stamina and a weak immune system, leaving them open to infection.In women, being grossly underweight can result in amenorrhea (absence of menstruation), infertility and possible complications during pregnancy. It can also cause anemia and hair loss.Underweight is an established risk factor for osteoporosis, even for young people. Underweight individuals may be advised to gain weight by increasing calorie intake. This can be done by eating calorie-dense foods, such as dried fruits, cheese, and nuts.[13] Body weight may also be increased through the consumption of liquid nutritional supplements, such as Ensure and Boost. Other nutritional supplements may be recommended for individuals with insufficient vitamin or mineral intake. Another way for underweight people to gain weight is by exercising.