Weird feeling while masturbating

I bought my FIRST vibrator, I’m 21 and a virgin so I’ve been so horny lately. When I was using it though I was making it go in and then almost out but not fully. Every time it’d go in, it seriously felt like I had to toot (sorry tmi) 🙈 Idk if I’m just not doing it right or what. I didn’t feel as good as I was expecting it to feel but I think I came cause there was white liquid on it when I took it out. Am I doing something wrong?