virgongrlnxtdr, are you taking B5, it's supposed to thicken your hair and you will see this with new growth. For the hair towards the ends that may appear thin, some leave-ins do make the hair look thicker/fuller - Nexxus Humectress (I think) is an example. Also air-drying might help it not get so straight and thus disguise the thinness. Braidouts are another way to make your hair look fuller. Perhaps you could airdry your hair in a pony-tail braid then when your hair is dry and you undo it, the ends will look wavy and fuller.
Giving dry heat a rest might help too. (I specify "dry heat" coz I believe it's OK to deep condition under a plastic cap using heat.