[HELP] What should I do in this situation? Please help me.

Hi everyone. Please read and help me, I have big problem. I recently post on the various subreddits seeking advice for certain issues in my life. So basically, I am a disabled person. I have made several posts in the past related to that but I didn't know about the exact name of disability but only symptoms that I face. But in recent times, someone said something personal to me and I looked up the name of my disability on the internet (for the first time in my life). And found out that I am facing not just physical disability but have huge learning problems which make me difficult to understand maths, logic, abstract ideas etc. I also suffer from executive function, ADHD, behaviour disorders and have lower maturity level than many of my peers.

Few months ago, the first time, I have made appearance with non-familiar people (non-family or friends) and I realised even kids far below my age had more maturity than me and I am making poor decisions or difficulty. All affairs were/are still managed by my family so I never did any chores nor did I ever stepped out of the house alone.

I had sone problems in my studies after 1st year and told my parents about it but they told me to continue and have completed it. Another strange thing is, I am unable to place things one-by-one in my mind and follow their logic (for example I am learning some course online but unable to process it).

Question is: As I did study from good colleges. Now, for first time, got out of my home alone and face non-familiar people which made me release that I have very lower maturity, behaviour than others, unable to make decisions and feel very low. I always had issues regarding delayed development issues (if I look back now), but neither me or my family took them seriously.

Now, my family and I also expects, to be sitted on reputable position and earn livilihood for myself and family. But I released that my recent released thing that I might be just a child in the body of adult. Family took care of me like 3-5 years old baby and my brain is not mature enough for outside world.

I have trouble tieing laces, combing hair, counting notes faster, not able to brush until class 7 etc. After the releasation that I might not be normal, mentally (not just physically, as me and my parents believed till now) as well. I told my parents about how I feel recently, and certain examples from the past where I had trouble doing some tasks. But they brushed it off saying you studied from good college so be confident and ignore the these things. But from last week or so. I have panic attacks that I assume I am just physical handicap and will one day become productive member of society and now I might be just a sick person in the house (if my parents allowed me to stay in). If they didn't, where will I go? How will I be able to afford food for life (assuming parents did not throw me out). What will I do for life being bedridden and mentally ill? I told my parents that I want an check up from a doctor about how I feel and to see if I have some neurological issues or not but they ignored me?

If anything is not making sense to you like how can I be so dumb, please remember I am actual dumb and immature and a brain-child ( I discovered it just now).

What should I do in this situation? VERY SERIOUS. PLEASE.