I did consult an ADHD specialist 2-3 times and they were unsure of ADHD but said I possibly have a personality disorder and maybe, a intelligence issue too. I did not visit them after that due to procrastination.
In my opinion, consider trying several therapists until you find one that works well for you; they vary significantly.
Personally I think you shouldn't strive for the usual career, money, big house, many friends or whatever people commonly consider 'successful'. Life has only the meaning you yourself give it.
You might be better served seeking creative activities, maybe volunteer jobs where you act as buddy/support partner for others, (community?) gardening or whatever. Or something totally out there like go on a continent-crossing hiking journey.
This planet is big; life's too short to see & do everything. So regardless: do less of what makes you not happy, and do more of what does. But 1st go seek professional help.