Well to keep it plain and simple, 

I've been slowly dating this girl and I slowly realized she is not what I am looking for.

We've have trust issues because she has now lied to me twice about smoking pot after she said she would not smoke anymore and same thing goes with drinking a lot of alcohol.

She really is a nice girl but is influenced by her sports team way too much and a girl with lack of self control is very unappealing to me.

I would also like to date a woman and not a girl, which sounds awkward for my age I guess.

Anyways the back story is not too relevant the real concern is:
What steps should I take now with breaking up with her?
Like I said, her birthday was today, I already bought her present and gave it to her briefly while she was drunk with her team.

I was thinking of doing so ASAP, but I do not want to ruin her birthday. I'm thinking in two days or so, I don't want to delay things either.
user
I want to break up with her, but her birthday is today.
assistant
Well to keep it plain and simple, 

I've been slowly dating this girl and I slowly realized she is not what I am looking for.

We've have trust issues because she has now lied to me twice about smoking pot after she said she would not smoke anymore and same thing goes with drinking a lot of alcohol.

She really is a nice girl but is influenced by her sports team way too much and a girl with lack of self control is very unappealing to me.

I would also like to date a woman and not a girl, which sounds awkward for my age I guess.

Anyways the back story is not too relevant the real concern is:
What steps should I take now with breaking up with her?
Like I said, her birthday was today, I already bought her present and gave it to her briefly while she was drunk with her team.

I was thinking of doing so ASAP, but I do not want to ruin her birthday. I'm thinking in two days or so, I don't want to delay things either.
user
I want to break up with her, but her birthday was today.
assistant