Do you think your "thoughts" can actually help manifest things in real life?

well let us see, according to my aunt(whom i love but i don't understand) i have a brain tumor because i want one... go figure... i want to feel better sometimes and i do. i want to get sick sometimes and i do.(but then again i am almost always sick so i don't think that concept worked). i wanted it to rain today in the RGV and it did. hm mm... i think that our way of thinking affects our daily life but i doubt that i can change something that is in God's plan in the first place (even in the darkest of times God does have a plan for people so no one criticize me for my beliefs)