It only feels right?

My (28m) and my sister (25f) started having sex when I was about 17 or 18, I'm not sure why or how the first time happened but just that it did. That was 8 years ago. We kept it secret because we felt so ashamed so it became this crazy secret that I was excited about and anxious about. I've always felt so ashamed and embarrassed about it and we've been so secretive about it but for the first time in my life I'm starting to realize that it doesn't feel wrong. It feels right. I'm still afraid of what my parents or others would think if they knew and I'm definitely not saying that I condone incest in the name of the lord or something but I feel like I'm ready to talk about it. I've been listening to the songs from yourtopining and I finally feel like someone understands me. I was hoping to find some other people who feel like this.