what to say to this girl?

[Doug]

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. What should i do? please help
were freshmen in high school