how to get over initial sadness

just began LDR with my bf this past week. I don’t want to complain because it’s very temporary. We will be in the same city July/August and the next time I will see him is the first week of June. I’m just feeling sad and anxious. I know it will be okay but it’s hard not to imagine the worst. I know a lot of people have it harder and don’t want to complain to my friends as a lot of them are single and wish they were in a relationship.