Will i get chronic hamstring problems if i tore my hamstring (grade 2) the 2nd time after going back to sports too soon after the first injury?

I would not concern myself with the future. You need to contend with the present. You are 14 years old. Probably still growing. ( only X-ray will tell). You tore your muscle. It will heal in a shorten position. You will need to have a structured program in how to contend with this presently and in the future. If you wish to participate in sports it is more critical to have a structured program.