Help me come please!

Usually when a girl orgasms there pelvic floor goes in and then relaxes when they come, but for me, my pelvic floor stays in and prevents me from coming. It just leaves me with this weird feeling in my stomach, and then it pulses once it's over. It wasn't always like this, but I stopped masturbating for a few months and when I started again, it started doing this. I have been trying to relax it when orgasming but it just goes it anyways. I have been trying Kegels as well for about a month or so and it's still happening! Please, please help me!