You could be talking about my own son! Emotional, not very sporty but plays and likes sport etc etc.
I think every child is different and you should not worry. My son is coping admirably with the leaving at 7.05 ( I not so admirably!) and the long bus journey there and back to school. It was pitch black when we left this morning!!!
Nothwithstanding his long days, he is clearly thriving at his new school and we came back glowing after a great Parent Evening last night.
He has been on fish oil supplements since the age of six ( he has a mild speech and language disorder which I feel has been helped immeasurably by these, (a controversial subject I know but it works for us) plus a daily jelly vitamin (just moved onto the 'young adults' from the kids version , how time is passing.....).
He is an early to bed but also an early to rise, but his general health is excellent, he hardly gets ill.
So in summary, I don't think you have anything to worry about. Remember the story of the tortoise and the hare