Hey KayserRF, It is great you are playing tennis and having fun. Starting to play tennis at 12 or 13 makes it is pretty difficult to turn pro. It is really pretty difficult to make it as a pro starting at any age.
As a 7.2 at 15 almost 16 you are in a tough spot. I would suggest playing in some local tournaments and see how you do. Playing ITF’s or Tennis Europe is going to really throw you in the deep end of the swimming pool.
The ITF guys are going to be level 6.1 at least and probably 5.2 and higher. You might find a 7.1 in Tennis Europe but it is unlikely.
Have fun, keep playing, and more than anything else study hard in school. Most people go pro in something other than sports.