Suddenly addicted to masturbating

So I have been sexually active for a little more than a year now, on and off. I have never masterbated in my life until a couple months ago. I dated one guy and the sexual stuff was very good and he could get me very satisfied very easily, because we were extremely comfortable with each other. Then I went a long time with nothing, and now I am in a very stable relationship and we have started having sex regularly just recently. We are in love, but its the kind of love where I'm still afraid to do the wrong thing cause I don't want him to leave. I still kinda hesitant with everything, I can't just let loose. I have been close to orgasm with him, but haven't gotten fully there. But recently he went away for 3 weeks and I was particularly horny so I decided I was going to try and masturbate and make myself orgasm, because I wasn't sure if I had really ever gotten one before.

I did it, and I knew right then that was what I should feel, but I can't get there with my boyfriend unless he is just fingering me. I loose control and I am afraid. I got orgasm purely from clitoris stimulation and it was not very hard to reach my climax. I still have not came before and I feel like I can get more pleasure. So recently I have become addicted to masturbation. I am so determined to get more out of it each time. I think about it all the time, and have the urge to at random times. I have NEVER wanted to be "that girl that masturbates" but i am obsessed! I can't fall asleep without doing it ect. I was grossed out by the thought just months ago... Is it just because its new to me, and I am experimenting? Do I have a problem? Help. I can't stop, I enjoy it too much. Am I going to become a sex addict or something?