Should I get a attorney if I was charged with DUI and no drivers license and no miranda right were read to me?

I'm 18, attending Texas A&M Kingsville and I'm worried I'm going to get kicked out of the university for this if it goes on my record. The officer said he could smell the alcohol in my breath and asked how much have I drank to which I said just 3. There was an empty open container which wasn't mine, it was a friend's but he left before officers arrived and I told them that(the people I hit must have told them that I was with someone as well since they were getting questioned and saw who I was with). I was arrested but no rights were read to me. I looked up that my Miranda rights are not need to be read in that situation which I don't know if that's true out not. But overall should I get a lawyer?