Time travel??

Ooh where should i start?.. i just wanted to write something so i chose this topic. I dont know anything about the recent experiments that are going on and as a person with no science background i can not boast of some terms related to Astro-physics. This is more about questions rather than answers...so please bear with me...or just close the browser.

Every one know that we can see things because the light falls on the object and reflects on our eye. Brain reads this information and tells us about the object. So the speed of light and speed with which our neurons transfer the information to brain and how fast the brain processes the information will determine how early we see the things and feel the things.

But time travel is more than just feeling the events faster. Lets dwell on what we really want here...what time travel really is? The only way i can tell is from what i want to do if at all time travel is possible....want to go back in time and set few things right and want to go into the future and know in advance about future events.
Lets examine the first statement carefully- "want to go back in time and set few things right.
1) When i travel back into my younger days, will my younger-self be there whom i can see? So there are 2 versions of same me (good to see our doc warehouse jargon helping me here)? If so how do i interact of influence the other guy (myself) from not doing what i have already done? Just like any other person we meet in day to day life? Since i have the information of what the future beholds if i do what i have already done...i share that information with my younger-self and ask him to not to do it/do otherwise? Lets take this proposition a bit further...since time travel is unknown he might see me as a mad man and ignore me. So while all this is happening, where will my current-self be in the current world? Will i be gone like say vanishing from the current world? So does that mean i am not living my life to the full and live in the past only?...hmmmm....crazy thoughts/questions...lets move on. I remember watching a hollywood movie with the same theme...i dont remeber the name but Bruce Willis is the star and there is one fat little kid who played bruce willis' younger-self. Only difference is Bruce willis meet his younger-self more by chance thatn by time travel.
2) Will I become younger and replace my younger-self and be put in the same conditions as i lived? If so the only advantage is the knowledge of future? As all we know we can control few events and we cannot control few events (please start with butterfly effect). Take the events which we can control. I sometimes feel i should have taken Science in 10+2. So if instead of accounts if i choose science and proceed further...will i become completely different person with different friend circle..different job profile etc? does that mean i can live the life on trial and error basis?? In developers typical language ....code >> compile >> publish >> debug >> recode>> compile and so on....? So if i replace my self does that mean i can live on eternally ????

Gowri...i know you want me to stop writing these crazy/stupid sounding thoughts and get back to work.... so .... that's all for the time being folks...... see you later