Don't know as this is a world wide site, so don't know what the cost of living is in your area. Have your parents given you permission to get a dog, it is after all their home, so they have the final say on whether they want a dog, in their home. Just as if you had to move out for what ever reason and had to find a pet friendly place, the landlord may also have breed/size restrictions, a pet fee, in addition to a security deposit may apply in addition to the monthly rent.
If you're a minor, you can't own or purchase property, dogs are property, nor can you sign any legal documents such as adoption papers, or give consent for vet care.
All other family members have to be in agreement in getting a dog, if they aren't the dog will suffer the most being in a home where it isn't wanted by everyone. Depending on what dog you're getting, don't forget to factor in the initial purchase price and/or an adoption fee. Dogs aren't a necessity they're a luxury.
Are you knowledgeable/experienced how to care, train and provide for a dogs needs, as no dog comes ready made to your whims, they require daily time/effort, patience, consistency, diligence, supervision, etc. Will you be able fit that into your schedule and continue working?
A dog shouldn't be left alone for more than 3-4 hours daily, without being taken outside and walked for elimination, once you've housebroken it, prior to being house broken, they may need to go for walk/elimination times every 1-2 hours, training doesn't happen in a matter of days, possibly weeks, most likely it could take six or more months.
In addition most dogs also require daily aerobic exercise, such as running/swimming, minimally 20-30 minutes, as well as daily mental stimulation, such as obedience training, 10-15 minutes, some dogs require 3-4 sessions daily of each, aerobic exercise and mental stimulation.
Dogs are 12-17 year commitment, regardless of any lifestyle/financial changes. Do you know where you will be at any time during those years?