Your school almost certainly has someone who can tell you whether that self-diagnosis is likely to be accurate or not, and if it is accurate, there are treatment options available which have been lifechangers for some people I know.

Someone with demonstrable programming skills who has a bachelor's degree in just about anything is in a pretty good position in life. People at universities care a lot about what the exact wording of your degree is. You'll find that that is considered fairly eccentric in the real world.

I strongly suggest that you do not drop out, though. Among other things, dropping out suggests you're incapable of accomplishing clearly advantageous things if you're the least bit challenged by them, since we give degrees to basically anyone with a pulse. People probably can't legally not hire you for being ADD, and in our industry a certain attitude with regards to follow-through does not make one all that much of an outlier, but "cannot get stuff done" is a bad place to be.

P.S. You may already know this, but if you haven't figured it out already, "I am ADHD" is something that it makes very, very vanishingly little sense to broadcast, regardless of whether you have been diagnosed with it or not.