Welcome aboard!
Fine hair here as well. The best thing you can do is start loving your hair as it is. Don't see it as something stupid and forget that you have a bad personality just because you have thin hair. Almost 50% of people have thin hair, IIRC, so don't be upset. You can use voluminising shampoo's and conditioners, but a good base of health food, proper products for your hair and exercises will be the biggest, least expensive and least time consuming things you can do to cope with your hair.
But accepting it as it is helps a lot.