I'm sorry that it's been frustrating for you :(. Are you new to LSPDFR? At the moment, a new GTA5 update came out so a lot of the mods probably need to be updated to work with the new update. I'm not sure because I'm using a backup of the last version of GTA5, and I'm just playing offline at the moment. If you are new to LSPDFR and you would like a list of mods that I know are really reliable (again, not sure if they all work right now with the brand new update), I would be happy to give you that list. I will say that once you get everything working it's pretty awesome.
Please let me know if you would like that list. Modding gta5 is certainly a daunting task for newcomers, and it doesn't help that they keep pumping out updates all the time.