In my birthday I have only cake and happy birthday song. = On my birthday I only have a cake and my family sings the Happy Birthday Song.
Because my birthday is th beginning of th term. = Because my birthday is the beginning of the term.
So I don't know my classmate. = So I don't know my classmates yet.
Party is needs many friends. = To have a party, I need many friends.
but I havn't. = But I don't have them.
I want fancybirthday party! = I want a fancy birthday party!



my birth day- 3/18 = My birthday is on March 18th.
shcool begin- 3/? = School begins around March as well.