Hi Hiddename:(
What you are feeling sounds perfectly logical. You are expressing the most basic of human desires - the desire to connect with others. We're not really designed to be isolated creatures, instead we're designed to be interactive creatures who evolve through connecting with others.
Do your parents realise how isolated you're feeling? Do they know how much it means to you to see and spend time with your cousins? Being a parent myself, I can tell you that we can be pretty oblivious to certain things regarding our kids, until our kids actually tell us what's going on in their mind. Is it specifically your cousins that you miss or do you miss the opportunity to spend time with people in general? If it's the latter, have you considered joining clubs/groups which promote young people coming together. Researching what's going on in your local community could be the way to go. If you're not a sports minded person, there will be other options I imagine.
Shifting your focus from isolation to managing new connections is important. Being young, you'll need your parent's involvement when it comes to helping to arrange connections (whether it be visits with cousins or signing up to social groups). Consider having a talk with the parent who will best be able to relate to how you're feeling, whether it be your mum or your dad. I'm a firm believer that parents have a duty of care to their child's mental, physical and spiritual well-being. When I say spiritual, I'm talking about our sense of connection to life in general. Our spiritual health is vitally important at any age.
Take care Hiddename:(
