I'd say it's different. You mention things that are traits of bpd, but they could be traits of other things as well. That's why it's best to see a psychiatrist for proper diagnose. From what you write "my opinion" I'm not convinced it's bpd. The irritability, suicidal thoughts, Lack of sleep/too much sleep could be depression, in fact, the sleep issues would be more depression related then bpd.. The not knowing who you are could be related to your age, and the stage of life you're in. There's many people your age when transitioning from teen to young adult don't fully know who they are.

It's also possible to have a primary diagnosis, and the traits of something else. You're always welcome to post here, ask questions, but be sure to see someone to be properly diagnosed.