i dont want to tell you that you are, but you may be.
if u are naturally slim, then your chances are already higher of being able to break 5.
adaptability in training is also an important factor. some people start off with a high baseline for talent but cant get much better even with training. other people have low baseline talent but respond super well to training. jim ryun and gerry lindgren are classic examples of people who didnt seem very talented but trained to become great.
jim's first mile time trial i believe was in the low 5:40s as a sophomore, but he was able to improve drastically from training and became the first ever high schooler to break 4 minutes in the mile. he did this with lots of hard work too. while he was probably training like most of his teammates when he first started, he did do 100+ mile weeks with a relatively heavy load of interval/repeat work.
gerry was supposedly so bad when he started that he would trip himself in practice because he was so uncoordinated and weak. his middle school coach made him do a paper route instead if practice with the team which was 2-3 miles long. when he got to high school, he went out for the cross country team and was again the worst guy on the team. he was only 5'5" and super skinny. he almost quit the cross country team until his coach convinced him to stay. his coach, basically told him that he could motivate the other runners to work harder because of his lack of talent. so he stayed. he got better and better and was doing 3-4 runs everyday. he ended up totaling 200+ miles a week as a high schooler, setting many records, and making the olympics straight out of high school. he may have even won the olympics but he sprained his ankle.