Family Based Holidays

I just got invited to my friend's thanksgiving only because I said I hadn't done actual thanksgiving in 5 years. Simply because I've always worked during that time to forget that it is a holiday. I'm really appreciative of the offer, and I am going. but I'm now feeling like I'm intruding on a family even that isn't mine, Their family is really lovely, and I know that they are very welcoming. I just feel like its pitty on me. family oriented holidays always suck for me and I'm really trying to put a happy face on cuz I'm finally able to celebrate but it is unfortunate that it isn't with my own family. It kinda just sucks that I have to depend on my friend's family for this kind of stuff.