I have been playing the violin 4 about 7 years. Im playing really hard pieces and I just started to do shifts up to 7th position. Its kind of confusing, but the most confusing position 4 me is 2nd. Its one of the 1st positions u learn. And its kind of easy, but i always end up falling back in 1st or 3rd. Any suggestions?

Yea practice makes perfect!ask ur teacher they are always happy to give advice and exercises to help.

play some scales in 2nd position.
also start to use 2nd positions in your pieces, there are times when the 2nd position is most appropriate.