Guilt Over Christmas Gifts

In short, it hasn't been a great year for me. I don't have much disposable income due to being laid off. I did land another job but the salary doesn't allow for much left after I pay my bills. Two separate friends have mailed Christmas presents to me. I didn't get anything for them and I can't afford to do so. But as I stare at the boxes before me, I feel nothing but guilt. I know they were trying to do something nice but it makes me feel horrible that I can't reciprocate. And I'll have to go through opening the gifts and then acknowledging their kindness - but it doesn't make me feel good - I just feel like crap and wish they wouldn't have bought something for me.