Today

It is snowing outside，I think it is the first snowfall of this year. The piano sound from upstair woke me up，she／he must have a diligent mother because in spring festival that child continued playing it. Yesterday I found some beautiful girls in my QQ group, I felt jealous and I wanted to be a beautiful girl . Not only from outside ,I mean appearance ,but also inside. I want to be perfect even if I know it is impossible, I will try very hard.
Thanks Nancy, for correcting my punctuation！

i hope you don't mind if i correct your note... Peace!!

Not only from  outside ,I mean appearance ,but also inside.

You can say it this way but the usual collocation is :

Not only on the outside,I mean appearance , but also on the inside.

Today

It is snowing outside;  I think it is the first snow of this year. The piano from upstair woke me up. She/he must have a diligent mother because in even during the spring festival, that child continued practicing the piano.Yesterday I found  ("came across" might be better choice) some beautiful girls in my QQ group. I felt jealous and wanted to be a beautiful girl too: Not only wanting beauty on the outside appearance, but also inside as well. I want to be perfect. Even I know it is impossible, but I will try my best.
Thanks for Nancy to correct my punctuation！

I hope you understand my edits.  I changes a couple of sentences so it flows better (well at least in my head).  Hope you do not mind.

Today

It is snowing outside. I think it is the first snow of this year. The piano from upstair waked me up. She／he should have a diligent mother since it is the spring festival time，and child continued playing. Yesterday I found some beautiful girls in my QQ group, I feel jealous and I want to be a beautiful girl . Not only from outside ,I mean appearance, but also inside. I want to be perfect even I know it is impossible, and I will try my best.
Thanks for Nancy to correct my punctuation！