Do I Have MD or am I making it up?

I would say yes, you are maladaptive daydreaming. When you have an emotional attachment to characters and places in your daydreams, when you feel as though they're real even though you are fully aware they are not, when you have the tendency to move around (or "act out" as you put it) while daydreaming, and when you have the ability to snap out of it easily, those are common MD symptoms.

You didn't say whether or not you do it often to the point of addiction, where it can take over your life. Many others who maladaptive daydream will prefer it over real life. This causes procrastination with real life tasks and activities, and the choice to replace real-life expectations such as going to work/school, making excuses to miss functions and socializing, etc.

These are all things we talk about here to try and find a way to cope. Also, "finding a doctor" to talk about your maladaptive daydreams is extremely difficult. Dr. Somer elisomer began making his research public in the early 2000s, yet talking to a GP to initiate help from a therapist often goes nowhere because it tends to be brushed off as kid-stuff, and to "just stop". Even many therapists aren't cluing in properly to what MD is - almost two decades later.

This is such a hard disorder to detect because individuals who have it keep it concealed to the point of perfection. Since we know we do it, and can stop anytime, it's easy to excuse. Also, since it's morbidly embarrassing to talk about, many individuals fear that they will seem silly or that their relationships with others will be damaged if details of their daydreams are ever learned. It's also negatively and inaccurately described as a mental disorder, or more specifically schizophrenia or dissociative disorders. Though there are people with mental illness who also MD, MD in and of itself is not a mental illness. I think I once read that Dr. Somer described it as a behavioral disorder. I agree. Choosing to daydream over having a real life is definitely a behavioral problem. If you can't seem to stop, then it's an addiction.