How do I tell her?

If you saw my previous question it was about whether this girl’s behaviour was just weird or if she liked me back. Now I’m tired of waiting for her to make the first move and keeping my feelings for her is starting to become a weight on my chest. I’ve been liking her for over a year now but until last summer I thought it was just a simple crush. Now that I know for sure that it’s not just a crush I’m okay with telling her. However, on one hand I really want to tell her to get this weight off of my chest and see how it could actually go, on the other hand I’m so scared since we’re in the same class and things might get awkward. Luckily we only have 5 months left of the last year of high school but she literally sits in the desk next to mine. I want to tell her that I’ve been liking her for quite a while but I have no idea how to. My last relationship ended almost 2 years ago and she’s the first person I’ve liked since then, I’m slightly out of shape when it comes to telling someone I like them etc. so, how do I tell her without making it super awkward in case of absolute rejection?

How do I tell her?
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