[quote name='mrbacco' timestamp='1471263000' post='3111610']
OK, don't laugh loud here ... I am using a 15-watt Fender Frontman 15G amp the one I used for my guitar with treble at 0
[/quote]
Not laughing.
I went and bought a "bargain" bass from a girl. She'd been in a band and had used a Fender Frontman amp. The amp came with the deal. It's fine for a guitar. It's a guitar amp. It sounds absolute cr@* with a bass. Seriously, don't worry in the slightest about pups, strings, or ANYTHING until you've got the reddies together and replaced that amp.
To give yourself a better feel about your bass, as Howie says - try another amp. Just to give you the feel that your bass IS what you want and keep the motivation. Even a visit to a fellow BCer, could be an option.
Good luck and keep with it.