Is this a house cue that you use? When I was a kid, we used to hide our favorite house cues so we would have them when we played, under the table, on top of the light, in the broom closet, wherever other bangers couldn't choose it. Dufferin house cues and two piece cues hit pretty darn good. As for whether or not you should have your own cue, I think most on here (and I) would say definitely, your own cue will do a lot for your game. Familiarity with the cue, its weight, balance, hit, etc. will make it seem like a part of your body, and you'll shoot better in the long run. You'll still shoot good with a house cue, but your own cue will play much better for you. Whatever it is, so long as it's a good quality, soundly built cue, you'll come to love that feel and will search for it with every cue you buy in the future, with minor adjustments you run across that work best for you. My personal shooter is perfect for me, you might hate it. Same as in all things in life.
There's a famous story of Larry Liscotti (the straight pool player from the '60s-'70s)...Somebody might know the story better than me and correct me, but here goes...he was tearing it up as a teenager shooting with a slightly warped house cue conversion. His father decided to buy him a Balabushka, and took him to Long Island to put in an order with George. Larry wanted a sneaky pete made that would have the exact same wobble in it (!). Balabushka refused to make a warped cue, but finally relented after the young Liscotti insisted. It cost him (IIRC) about $100. He would later buy a much higher end Balabushka, I don't think it wobbled! The point is, he found his "perfect" cue as a teenager and when given the opportunity to have a custom cue made by the greatest maker ever, he chose a carbon copy of the piece of junk he was shooting with from the beginning. It wasnt' junk to him, but what he preferred at the time.