I think i am suffering from ADHD

I am not able to focus on my studies more than 20 minutes that's why I never participate in competaive exam because it require lots of focus and attention.but know I felt bad for myself because if I want to succeed in life than I have to prepare for competitive exam.but sitting is very low not just in studies but I am not able to focus in many areas of life .like I face problem in driving.I do not remember the instructions given to me and make silly mistakes.I forget things very easily.and mood swings happen.sometimes I feel very good and after some time I felt depressed.stress and anxiety are persistent in my body for many years .even do not able to take decision whenever I take decision I felt anxiety even sometimes in a very simple deci

Sion .due to that I suffer a lot in my carrier and life .and I think this stress and anxiety create many physical health problem in my life from which I'm suffering even in present times like I have constipation problem from last four years. My physical health is not good I am underweight.and even happiness is gone through my life and I felt anxiety when i interact with people especially in social gatherings like marriage or family function its not like i do not want to interact with people but many a times my anxiety level is so high that i am not able to speak in front of people i face problem in remembering face of peoples whom i met due to that i face lots of embarresment of interacting with people specially in family function. Today I lost all my hopes and I see my feature in dark to get rid of anxiety and stress I did a lot of things such as meditation,yoga,prayer and real holy text baghwat geeta but nothing works even when I tell all these problem to my family they say this all means to escape from hard work.my school was shit and my college life was shit.I always face difficulty in organizing,planning and finish work on time .and I scared what will happen I will do job.since adolescent the problem become more problematic because to lower the stress and anxiety I start watching porn and masturbation. Which impacted my health severely even today I do such things to lower my anxiety.I have constant thoughts running in my mind sexual activity.