My friend is always competitive with me?

I take gymnastics with my best friend and she can do a backhandspring and i cant,so she always puts me down about it and telling me that i cant go on to the next level because i cant do that and that shes way better at tumbling than me.Also one day in the pool she could do a back flip in the water and go into a handstand that way and i cant and she put me down about that.Well stuff like this happens everytime i hang out with her!!!!!What do i do please help!!!!????? Thanks.(: