Relationships failure :(

Hey! Actually I am really suffering with almost everyone I know .. mum says I have got mad and dad says I am getting him health problems because he is very sad over my life !! Friends are telling me u r a kid in ur actions all of it !!! Some else said u r just letting emotions and feelings lead u while u r covering the real u inside .. one said that It is like making someone a cake and then putting salt on it !! Not sure what he means and then told me I have to change! I told him I needn't change for someone and that's just me like it or not ! But what was really upsetting is not only him who told me that!! I tried to talk to a closer one and he told me that I tend to talk alot and interrupt people while they r talking and tend not to listen as much as I want to be listened to .. he also said that I tend to be absent-minded most of the time like I am not even there .. and I have the worst memory ever .. reckless unorganized procrastinator impulsive .. sometimes they think I am irresponsible but I know I am .. the thing is I knew that my brother is smoking and has some really bad friends but don't really know for sure but I didn't take any action and even told him u r grown up enough and know what's good and what's bad .. he is 17 anyways!!
Only 2 yrs younger .. but what I noticed is that my friend seemed to show me symptoms of ADHD .. and had the test many times and was positive but never thought I need professional help how would it be bad anyways?! Many old people live with it and didn't really have such problems how critical the situation can be ?! And parents themselves don't believe me they think I am just overcoming my tendency not to study but however I work good under strain and get things done most of the time and eventually get high grades but still they don't believe I might be mentally destroyed !! What do I do?!

I'm having a little bit of trouble following your post. What is the exact issue? Do you think you have adhd? Can you explain a bit slower?

Yes I think I do. But not yet professionally .. the thing is many people think I am usually absent-minded and not caring and the other things .. I don't really know what's wrong with me .. is that like I really do have adhd or is it sth else ?! And if that adhd how deep and how hard the situation would be?! I never thought it would be like that?