thigh and back pain help!!!

ok heres the story peace by peace. I went on a famliy vacation to ireland and germany ( 7 hour flight )
and about 3 hours into it my left thigh hurts. considering i'm only 14 and play baseball, i was thinking it was just a little bruse. but when i get up to walk to the restroom on the plain, i nearly colapse in pain in my left thigh!

now not really colapse but pain that fells like i just got stabbed in my left leg. i walk to the restroom and i'm fairly ok on the rest of the way over. i play with my cousins with out a problem.

then i get back on the plane on the ride home, it hurts worse and i have no clue what it is! so i get home and tell my mom and dad and they say i'm fine..blah blah blah.

and 4 days later i have a baseball tournament in cincinati, ( i live in nashville) so it's about a 6 hour drive. anyway on the way there i feel the same pain in my thigh and it' worse! we get there and it still hurts but i am ok. then then in 2 days i go to a water park ( not the smart ) and i am fie that night. the very next day i go to play mt first game and my lower left back and thigh is killing me! i can't ven jog and i got to play center field?! i take advil and try but i not doing to well. it hurts all through the tournament and we lose badly. we swim at the hotel ( with my back pain nd thigh pain still hurting like heck) and get ready to go. on the ride home the pain is unbarable in my left thih and back and even my freind on my team!
now i am home and i try to play baseball in my back yard buti can't really rune cuase my lower back and thigh hurt. someone please tell me if i'm just a wussy or have a problem. thank you.