I'm a really fussy eater, I feel so unhealthy, what can I do?

I've always been a fussy eater. I don't like the textures of food, eg sauces, curries, soups, 'runny' foods, 'lumpy' foods, yoghurts, and I don't like foods which have overpowering smells. But recently I've just been getting sick of what I do eat and feeling unfit and unhealthy, but I don't know how I can change what I'm eating....