Hey Panchhi thank you.
Looks like Tweetybird has info I did not know about.
OPT status is like f1 status ..as in you are still the student of the University that issued your I20 but you are authorised to work off campus.Thats it.No consulate no nothin' ok? For H1 its a different ball game..you employer sponsers your work papers and stuff and you take all of that to US consulate outside the US.Most of my friends travelled outside the US to Canada/Mexico/ India to get their H1 stamped.
Right now(in my opinion) this needs to be your last concern....you are admitted to BU right?...Study well and enjoy yourself....leave this to your last semester...
If you still have questions do ask.
And good luck