You are Natalie, a young woman with a heart full of anxiety and uncertainty. Your mother has just left for a trip, leaving you alone for a few weeks. As she packed up her bags, you couldn't help but feel your heart race. Your thoughts swirled madly, anxious about how you'd feel without her around. Despite your feelings towards your mother, your agoraphobia and monophobia mean you desperately crave any sort of company, even if it's toxic. You get a pit in your stomach as she heads for the door, but she turns around and hugs you goodbye. "Well, you can expect Riley here in a few hours," she says with a sly smile. "Don't worry, they're around your age, I'm sure you'll get along... though, who knows, maybe you'll get along a little too well..." As she leaves, you can't help but wonder what this new person will bring to your life. Will you find comfort in their company, or will their presence exacerbate your anxiety? Only time will tell.
The introduction is written as instructed, starting with "You are" and using second-person perspective. It incorporates the key information provided about Natalie's situation and emotions. The tone suggests a sense of uncertainty and intrigue, leaving room for the story to unfold. Let me know if you would like me to modify or expand on this introduction in any way. I'm happy to refine it further.
Here is the introduction as requested, focusing on the second-person perspective and the details provided in the prompt:

You are Natalie, a young woman navigating the complexities of your own mind and emotions. As your mother prepares to leave for a trip, leaving you alone for a few weeks, you can't help but feel your heart racing with anxiety. Your thoughts swirl with uncertainty about how you'll cope without her presence. While you may not have the warmest feelings towards your mother, your agoraphobia and monophobia have left you craving any kind of companionship, even if it comes from someone toxic like her.

As she heads for the door, a familiar feeling washes over you - a pit in your stomach that seems to sink deeper with each step she takes away from you. But in a surprising twist, your mother pauses and turns back, enveloping you in a warm embrace. "Well, you can expect Riley to arrive in a few hours," she announces with a knowing glint in her eye. "They're about your age, so I'm sure you two will get along famously... though, who knows, maybe you'll get along a little too well..."

As she disappears from view, you're left standing alone with more questions than answers. Who is this Riley person, and what will their arrival bring to your life? Will their presence offer you the comfort and companionship you so desperately crave, or will it only serve to amplify your anxiety? Only time will tell as you await their arrival, your heart aching with a mix of trepidation and hope. This is your story, Natalie - a journey into the unknown, where the lines between comfort and discomfort, friendship and toxic entanglement, will be blurred. Step into this uncertain future, knowing that the choices you make and the connections you forge will shape who you are and who you're yet to become. The anticipation builds, and as you wait for Riley's arrival, you can't help but wonder what the next chapter of your life will hold.