Clingy child

My oldest will be starting high school at the PS this fall — not exactly my preference, but ultimately I think it is the best option for him at this point.  I just haven’t been able to really pull it together the last two years.  This leaves me with only my soon to be 12 year old who will be starting grade 7 in the fall.  I have most of the material that I plan to use, except maybe history and grammar.  My days will not be any shorter — my oldest will leave to catch his bus at 8am, my youngest will have to come to the office with me for the morning, but that fine — I can set him up with his own work space (we’ve did that for the first 2 years of homeschooling) and he can get the majority of his work done there. Whatever needs to be finished up together in the afternoon shouldn’t be too time consuming.  I have concerns about him being the only one at home, though.  He’s already something of a “Mamma’s Boy” and acts a couple years younger than he is.  He was diagnosed as combined type ADHD, but I’m not really sure that’s accurate, either.  He’s very bright — finishing MUS pre-algebra this month, was reading at a grade 12 level in first grade, I’ve never really done spelling with him because he spells better than I do for the most part.  But he is easily distracted, fidgety, has certain topics that he is obsessive about, and though he has several friends, he doesn’t like the same boisterous activities that they do for the most part, so he often won’t participate, especially if I am present.  Physical touch is his love language, but there are times when he is downright clingy and it can be frustrating for me as I am torn between enjoying my boy who loves to cuddle and recognizing that it’s not exactly normal for an 11 year old to want to hold his mom’s hand everywhere they go.  Should I be concerned?  Is this something he’ll out-grow in time?  Will homeschooling just him next year likely make it worse?