Can this happen?

So I am 16 years old and I have spent the majority of my life being pretty thin and living with a 12 year old boy looking body. Which is of course fine, I liked it just fine. But now I feel like I just started puberty even though I have had my period for years. Suddenly my boobs are growing and my hips and thighs got bigger. Which like doesn’t this normally happen earlier? But at the same time I feel my waist is losing fat and at first I thought I fell under weight until I realized everything else was getting bigger. I started getting more acne too.

I’m sorry if this sounds really self centered but I’m really confused.