<human>: So I have had a crush on this girl, we can call her Sam, for about 5 months and don't really know how to talk to her or get her attention. Let me explain: 

We are currently both seniors in high school. I have know her since elementary school and have always liked her but my feelings for her really grew at the end of my junior year. I had gotten my seat changed in my math class as we would every semester and I got a seat next to her. I started some regular talk, said hello when she walked in asked her how she was, etc. We would work together on most assignments sometimes joined with another friend of hers. Almost immediately I felt it and really developed my crush on her. I now and have been thinking about her all the time and can't get the feelings and thoughts of her out of my mind.

Here is the problem: I never really told her because of how awkward I thought it would be the next day having to sit next to her if she hadn't shared the same feelings for me. (Yes I am aware I should have told her then but I didn't. Not going to dwell on the past.) We are currently both seniors and only share one class together but I don't really have any time to talk to her. I still say hello if we walk out the door at the same time but after that we go our separate ways. I don't know how I could tell her or even get her phone number and talk to her for a bit and she how she feels. Like I said we are both seniors and I might not ever get an opportunity again after we graduate.

I need some advice/help with what I could or should do. Any and all help is appreciated. 

I also feel like I could be missing something so might have to add it in later via edit. 

And I will apologize for any grammar mistakes; I am pretty tired typing this.

Can you condense the text into a few key points?
<bot>: I have a HUGE crush on Sam and can't stop thinking about her. I don't really ever get the chance to talk her. I am seeking some advice..