T.J. Holmes is following in girlfriend Amy Robach’s footsteps by launching his very own TikTok account. The former Good Morning America host confessed he “always resisted” joining the social media platform, but he finally decided to do so with the help of some younger people. Like the blonde beauty, 50, Holmes, 46, called his first upload on the app an “introductory post,” as he believes some people think they know who he is just “based on a narrative and headlines” about their scandalous romance. “I am a dad, a runner, a d— good cook, a Razorback [fan], a podcaster, a partner and a longtime…