Sex drive differences with my (21F) gf and I (22M) while long distance.

My girlfriend (21F) and I (22M) have been together for 4 years and attend college in different states. It’s too far to see each other aside from breaks and we’ve realized it’s starting to create issues and tension when it comes to the intimacy in our relationship. We have very different sex drives and we’re often not on the same page. Sometimes it starts to feel like we’re just friends or something less than a long term relationship. Every once in a while we’ll do pictures, but it’s not something she’s comfortable doing all the time, which I understand. Sometimes for her it feels like we do too much and I feel like we don’t do anything at all. For the most part, everything else is good in the relationship. What’s the middle ground between always and never? How do we maintain the intimacy and sexuality of our relationship while long distance? I love her and I want our relationship to work out.