I make up excuses whenever my friends want to me to come over so that I have the weekend to myself so I can finish my current anime series. XD
you should be fine as long as you don't look like this:
I actually looked something like that when I was in high school. I never tucked in my shirts tho. I even had a red bandana I wore on occasion.
I did where these often tho-
heh, hard to believe those shirts are like 10+ years old now.

And read anime magazines and manga in class.
And I would always write my name in kana when handing in papers.
I was a dork, not really an otaku.