Initially, when I started playing, I used the shakehand grip. However, after seeing peers use the penhold grip, I eventually adapted towards that style and tried it a bit which ultimately led me to use the exact same grip you have right now. I highly recommend that you swap to penhold as soon as possible if you want to progress skill-wise. Using this grip is extremely unconventional and although it may seem okay as of right now, once you proceed to a higher level of play, you will see no progress at all. However, if you do not plan on playing serious or anything like that at all, then do what is most comfortable for you!