I told my girlfriend about how I feel

Guys I took a really big step in my relationship today and idk how i feel about it but my girlfriend and I are long distance currently while dhs away at college and we were talking about a bunch of serious stuff and I told her how I grew up being sexually attracted to my older sister and that’s why I like to do the sister rp in bed and I’m not attracted to my sister anymore (kinda of a lie I’m not really into her but I still fantasize about doing stuff with her AND my girlfriend at the same time) and she was shocked and I’ve felt a whirlwind of emotions since and she’s supportive of me she says she still loves me and isn’t uncomfortable or disgusted by it but the best she’s said is shocked and that we probably won’t have sex for a while because she needs time to think but she’s been really supportive but i still feel guilty and weird and sheyshsbsjsbehe