Can I Still Be a Muslim Even If I Grew Up in a Non-Practicing Family?

My mom used to pray when she was younger but stopped for some reason. My dad prayed too, but I remember him stopping when I was about 5 or 6, and after that, I never saw him pray again. I basically grew up without any real teachings about Islam, even though my parents were pretty strict and conservative in other ways. So, all this time, was I still considered a Muslim? To be honest, growing up, I didn't really believe in Allah (SWT). Alhamdulillah, now I've started praying and it feels so much better. I even said the Shahada by myself. My big questions are: **Was I a Muslim before, or did I only become one when I said the Shahada? And are all my past sins forgiven now that I've said it?**