Always worrying

I'm constantly worrying about my health. I'm so scared to get cancer or a tumour of some sort. I am worried because I don't go to the doctor often I will get something and it will go un noticed. Would I have obvious symptoms if I had cancer or a brain tumour? Would there be something serious that would tell me I have something wrong with me? I get headaches pretty frequently so it always worries me. I've also been ttc for 2 years with no luck which also makes me think there's something wrong with me :(