Worn chain rings, probably not. I would start by releasing the cable tension from the front derailleur and manually moving the derailler to make sure it doesn't have any binding. Next, grab onto the cable and pull it to create tension and then shift it to see if there is binding in the shifter. If there's binding in the derailleur, you can take it off and soak it in something like wd-40. If there's binding in the shifter, you can do the same or you can spray a degreaser into it if it is an STI shifter. If there is no binding, I would check the position of the front derailleur and/or replace the cable and housing.