YOU SAID:

Im am going to start a party with my self

INTO JAPANESE

私の自己と一緒にパーティーを始めるつもりです

BACK INTO ENGLISH

I am going to have a party with my self

INTO JAPANESE

私は自分自身とパーティーを持つつもりです

BACK INTO ENGLISH

I will have a party with myself

INTO JAPANESE

私は自分とパーティーをする

BACK INTO ENGLISH

I have a party with myself

INTO JAPANESE

私は自分自身とパーティーをしている

BACK INTO ENGLISH

I am having a party with myself

INTO JAPANESE

私は自分自身とパーティーをしています

BACK INTO ENGLISH

I am having a party with myself