Coffee pop vs water and tea?

I drink a pot of coffee and day with alot of vanilla creamer and 2-3 cans of 7up if i switch it to tea with skim milk and a tsp of sugar twice a day and lots of water do i have a good chance of losing weight? I am 28 and feel like im 60 and 50lbs over weight is that a good start?
Update: I am not able to consume ANY asparteme i have not had any aspartame in my diet for a year and have since come OFF all my anti-depressents me and asparteme dont't work i am also starting the gym tonight with a support group i don't wanna be skinny i just wanna look good and be HEALTHY :)
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