A couple of videos that will help you to learn how to speak like native speakers. Learn American Accent with practice of so many examples given in videos below.
free american accent training online
1 - R and W
2 - S and Z
3 - TH, Voiced T
4 - F and V, Sh and Voiced SH
5 - L
6 - Word Endings
7 - CH
8 - Vowel Sounds
9 - O A Vowel Sounds
10 - OO EH Uh Vowel Sounds