I'm A Freshman In College Right Now And Even In

I'm a freshman in college right now and even in high school I was having this problem. I get my work done on time all the time, but it takes me probably 3 times longer than it should to complete the assignment. That's also causing more problems for me because that results in a lack of sleep, and that leads to me not able to get up for class or I'm just in a very bad mood. I can't stay focused. Every time I'm doing homework or a project in my dorm room I get up about every 5 minutes and do something else. But it's not anything productive. It's stuff like looking at the tissue box across the room and walking over to fix it cause it's crooked. Or I'll pick up my phone and start texting and going on social media. In addition, when I'm in class I will have only a notebook and pencil on my desk, I will put all distractions away, and tell myself I'm going to pay attention. But that's my problem. The whole time I'm looking at the teacher and what he's writing, I tune him out and all I can hear in my head is me saying stuff like this: "Okay Sydney pay attention today this class is important, you aren't doing too well... I wonder what the girl next to me is thinking...That tree outside looks so pretty...Why is my professor wearing converse...He is so skinny!" I don't know why this happens but it does. Every day. When it comes to schoolwork I can't focus. It's not even just schoolwork though. I'm not even exaggerating when I say that every conversation I have, at some point if someone interrupts me, or I hear a bird chirp, or even if I just start thinking about other things in my head, I will completely forget what we are talking about. It's not just that I'm forgetting what I said either.. I don't even remember the topic sometimes. My friends have brought this up to me before, that I'm always like "wait what were we talking about?" in the middle of a sentence. I'm not sure what is going on but I know I'm probably not the only person that has this issue.