how to talk to this girl?

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I really like this girl and I want to talk to her but i never have a chance or know what to say to her, but i think today might be my chance. It's her birthday but i didnt feel comfortable telling happy birthday in person so i'm going to on twitter but i dont know how to. I feel like I should dm her happy birthday because i hardly ever tweet so everyone will know i like her if i tweet it, but i also think she might think i'm a little creepy for dm'ing when i could have just told her in person or tweeted. Should i tweet her or dm her? please any help is appreciated

PS were freshmen in high school and we already got home so i cant tell her in person