Tooth 14 and 15 are missing and I can't afford implants, would dentures be a good option?

Are you also missing teeth on the right side? If you are, then a “partial denture” to replace all the missing teeth in both sides. Now, if you don’t have any missing teeth in the right side and only with #14 & #15 missing on the left, then partial denture will not work. It won’t fit stable enough. If that is the case, you can talk to your dentist about a 3-unit cantilever bridge (12-13-X), but with that option, you’ll only get one molar (#14) back.

A partial denture is a like a can opener which will cause you to lose more teeth over time. Save up for the implants. In the mean time, have your dentist make you a upper and lower clear retainer like an Invisalign retainer which will keep your teeth from shifting.