How do I go IRR?

I’m about over the reserves after 4 years in. I have never passed a PT test since basic so I can’t get promoted. I’ve been an A1C my entire time being in. My unit is 3hr30min and I’m tired of driving state to state monthly just for a weekend especially my fiance and I share a car. I have no morale at this point. Yes these problems are caused by me but I’m almost done with college and rather keep pursuing that. How do I go IRR?