On my last birthday, I went to 63 Building Buffet with my family. It was so delicious, so I ate all I could! I ate rib, frog leg, jelly, juice, ice cream, macarog and cake. I was so hungry at first, then after that I was really full! It was my best birthday party ever!

Julie: In my birthday, I went to 63building buffet with my family.
Correct: On my last birthday, I went to 63 Building Buffet with my family.
Explanation: Since it happened already, it's better to use this pattern. It was a name of a place, so better use capital letters at the beginning of every word.

Julie: I was so hungrt before I ate buffet, when I ate food, I wad really full!
Correct:  I was so hungry at first, then after that I was really full!
Explanation: Please be careful with the spelling "hungry". It talks about "at first", so better have this format to make the sentence understandable.

Julie:  It was my best birthday party in ever~~!!!!!^^
Correct: It was my best birthday party ever!
Explanation: No need to put prepositon "in" when talking about "ever".

** Thank you making this composition, I greatly appreciate it. Belated happy birthday to you. Take care always. See you again! ^_^