Zoloft Having Reverse Effects That Are Also Good?

I was diagnosed with anxiety and have been taking zoloft for 3 weeks now. For anyone wondering, the first couple days to a week was pretty rough getting used to it. Such as being extremely hungry but also can't eat (I'm very underweight), Extremely weird sleeping patterns and drowsiness, a sort of constant panic feeling for the first 2 days, and a couple other minor things.

After that first round of bad things I have noticed a positive difference, but something is off about it. Instead of what I thought would happen, where I feel more comfortable getting out of my shell, and being able to talk to people or handle situations without being scared, I only feel a sense of peace being alone. I don't want to get out of my shell, but instead feel more comfortable being in it. I just go to work and come home and enjoy my hobbies without thinking much about anything other than common life stresses.

I'll sum this up, and ask a few questions. Has anyone else also had this sort of peaceful introverted effect from it? Does it eventually change in to extroverted-ness? And lastly, does anyone else just feel like they are destined to be locked as their introverted self no matter what they try?