I can't stay doing one sport/activity? D:?

Alright, i'm 14 and last year i LOVED BMX Racing and Freestyle and i'm still doing it and i still love it, but i'm also skateboarding and i might try free running with my friend. I don't wanna quit doing bmx or skating, but sometimes i get scared i'm gonna quit them for something else. But when i start skating or biking then i start loving it. Help?