110 (I know we don't know each other, but may I call you 110?):
I'm going to be very honest with you (and most others who have chance me threads).
STATISTICALLY -- a 3.75 (unweighted??) with a 2250 SAT puts you in the group of students from which NU chooses the bulk of its freshman class. The GPA is perhaps a tad below average but the SAT is perhaps a tad above average. Neither will disqualify you and neither will blow anyone away.Having two activities with 8+ years of participation shows dedication and probably works in your favor.
Overall, many students with stats similar to yours will be accepted and (consider that NU's overall acceptance rate is 15%+/-) many will be rejected.
If NU interests you I would definately encourage you to apply.