I'll go further. By specifically naming the mental problems we deal with, while useful for categorizing symptoms and seeking treatment, we also create this phantom. The human mind is weird, and we will subconsciously project our own thoughts and feelings onto anything- animals, paintings, etc.
This is normally harmless, except when we have these mental illness "phantoms". By giving form to certain behaviors we have (like ADD), we can then blame our personal failings on these phantoms, rather than on ourselves. Again, not saying these illnesses are fake, simply that thinking about them like things instead of groups of behaviors, we set ourselves up for failure.
You should be trying your best now to counter these behaviors. The three most important things for a functioning human being are the following-
Sleep: Irregular sleep, or not enough sleep, will weaken your willpower and your focus. Both of which people with ADD suffer from especially.
Diet: Poor diet can lead to irregular energy levels and poor physical health, and your brain requires certain daily nutrients.
Exercise: Humans evolved exercising weekly, if not daily, and failing to do so leads to poor mental health.
I know because I was in your exact same situation. Diagnosed with ADD and depression. Could never focus on homework, made poor decisions on how I spent my time. Ate poorly, and rarely exercised. By fixing my sleep, I felt it was easier to focus on schoolwork and other responsibilities. Once that was down, I fixed my diet, and began exercising. Without ever taking any pharmaceuticals or going to therapy.
Again, if your family/friends treat you like shit, it is either because you are shit and need to look at yourself critically, or they're just shitty people who you should tell to fuck off. Your mom spat you out of her vagina, that's all. It implies nothing further about your relationship.