I am concerned but it doesn't make me want to jump and get a negative diagnosis just yet because there may be other reasons for these behaviors
An experienced neuropsychologist, familiar with gifted, directly observing your child, working with him, and having your complete family history on the intake form, is likely to provide more reliable information for your specific child than all the well-meaning parents on a forum sharing our best BTDT advice, cautionary tales, and lists of helpful resources.

That said, a diagnosis is not necessarily negative. It is information. If reliable and accurate, it can help you begin to work with your child earlier rather than later, and lead to better social relationships and a happier life much sooner.