I am a hard gainer, because I am naturally hormonally challenged as compared to someone in their prime.
Wait a minute......
So what. Suck it up, deal with it, and do something about the situation.
Your body depends on you.
Let me get some sand paper and rub my tears to ensure it leaves a sore rub spot, and realize that I must recognize the difference between the things I can change and the things I cannot change, and gain the wisdom and education to do it.
Some create their own hard gainer circumstances, because they are uneducated in what they are doing and do not garner the education in order to manipulate changes.
Most things like this can be overcome. Overcome yourself is the first step. Getting motivated in how to do it, is the second step.