Like many songs, it's gasp about drugs! Kacey is saying her life has always been too crazy for her since the day she was born (she was born extremely prematurely, which is what the "haven't been early since '88" refers to). So, now she is just going to drink ("good in a glass") and smoke ("good on green", "slow burn"), and drop acid ("take a look at all the flowers" - if the bar is closing in an hour, it's night time, and so she's not looking at actual flowers in the dark. And, for what it's worth, she indicated that she wrote this song while on acid. This also aligns with all the out-of-sync-with-time lyrics). And, you may not like that she is drinking, smoking, and dropping acid, but she doesn't care, because she knows you don't know what it's like to be her. So she's going to "do it [her] way", and "it'll be all right" and that knowledge is beautiful to her.
Like many songs, it's gasp about drugs! Kacey is saying her life has always been too crazy for her since the day she was born (she was born extremely prematurely, which is what the "haven't been early since '88" refers to). So, now she is just going to drink ("good in a glass") and smoke ("good on green", "slow burn"), and drop acid ("take a look at all the flowers" - if the bar is closing in an hour, it's night time, and so she's not looking at actual flowers in the dark. And, for what it's worth, she indicated that she wrote this song while on acid. This also aligns with all the out-of-sync-with-time lyrics). And, you may not like that she is drinking, smoking, and dropping acid, but she doesn't care, because she knows you don't know what it's like to be her. So she's going to "do it [her] way", and "it'll be all right" and that knowledge is beautiful to her.