Lgl34c straight talk phone tried to master reset my phone but its not letting me it keeps repeating the lg symbol over and over but never resetted how do i master reset it and make it a brand new

First of all I think you are actually rebooting into the wrong place being either the bootloader or recovery where you need to go, I think that must be fast boot but I'm not very familiar with that model. You need to boot into recovery and first wipe your cache partition let it boot up then shut it back down, reboot back into recovery and select wipe data. Now the important part is to figure out what combination of buttons works for your model and you had to do it just right or you will boot into one of the wrong partitions and end up where you are at. So Google your exact model down to the very last fine print detail and try to find the exact method to boot into recovery and we can go from there. You can just go into settings and factory reset from backup and restore but that isn't as thorough as this which will completely wipe all the residual junk