I'm no expert, but I would say the important thing for you to do is to just write, even if you're not impressing yourself.
Take one of your ideas and turn it into a finished song with intro, verses a chorus and a middle 8. The most basic pop song structure.
Then work out how to improve it, see if you can start to feel inspired. When you hit a wall, move onto the next most promising idea.
I believe that writing is a skill that can be improved through practice. Or at least that's what I'm hoping
Also, be realistic. Very few people have the ability of Jack White/Bob Dylan/Paul McCartney/insert name of your hero here. Aiming for that level from the word go is not realistic. Aim for as good as you can do then aim to improve. I think you should also be aiming to enjoy the process as much as you can. Be humble and don't be too hard on yourself. And who knows, you might suddenly surprise yourself?
I recently read that McCartney of of all people didn't really impress himself as a songwriter until he wrote And I Love Her.
Also don't be afraid to share your work here and take the crits. I've only been a member here for 2 weeks, but I find people to be very supportive of each others efforts.
Good luck!