Hello, and I hope I can help you today.
Sexual frustration is completely normal when you're away from your partner and have sexual desire for them that is unable to be fulfilled.
Depending upon your level of comfort,
masturbation is a normal and healthy way many people, both male and female, achieve sexual satisfaction without a partner present. Religious or cultural norms can sometimes imply that masturbation is harmful, however learning how to give yourself sexual pleasure can both empower you and enable you to teach your partner what pleases you best through trial and error.
Fortunately, in these modern times there are also easy ways for you to have face to face conversations with your boyfriend. "Phone sex" refers to partners having a dialogue, face-to-face or over the phone, which may be arousing and simultaneously masturbating to be able to have a shared sexual experience with each other. This is a common way that partners can achieve intimacy when they are separated by distance.
I hope that I was able to adequately answer your question today, and that my advice was helpful.
Best wishes, and good luck,
Dr. Brown