In order for you to feel comfortable and to play your bass well, both your amplifier and instrument needs to be set up properly.
Proper instrument setup includes: optimum neck adjustment (how much curve if any), is the bridge adjustment correct (are the bridge saddles adjusted so that the instrument is in tune, and are the strings the proper distance from the pickups)? Is the nut adjusted properly?
Does the headstock need string hold-downs? Are the pickups positioned properly? And after all this: does the bass play well for you? These are the many issues of getting your bass ready for serious playing.
Next, your amplifier needs to be adjusted, tweaked, and positioned for the best bass-sounding results. See the pages on equalization and acoustics for more information. Your position, for the speakers and amplifier, should be close to the drummer, assuming your band has a drummer.
As a bass player, you will realize, if you do not already, that you need to play primarily with the drummer. If you do not have a drummer, you will likely need to adjust your playing to simulate what a drummer would do, especially with the bass drum part.