Another regrets

This morning i wake up early to register at the pte..we thought that we c0uld register straight away..bt surprisingly they give me a form and tell me to come AFTER i hav fill the entries..which required me to go to the suamp to get a school sign and the pRinciple signature..after all the things completed..nearly 2pm we get back to the pte..unfortunately i hav to ask the sign of the teachers of the course i'm will be taking which is poa,eco and math..at first it going smoothly..suddenly awomen ask me to come to her..then she ask me what are the subs im taking..then she show me some papers n point to the subs im taking..then she look trough my result..she try to convince me to change the eco sub with phy..and guess what?? I believe her..so my new course is poa,math and phy..then i ask her about the poa..bt she said just leave it there..then quicly i submit the form..now when i think again about my course..i ask myself..why didnt i change poa with geo?? What the point of taking poa wo eco?? Its going nowhere..and the biggest question mark in my head..WHY ON EARTH DID I LISTEN TO HER?? I should hav just listen to my heart..so i dont hav to suffer this regrets..