Hi.... It is good that you are concerned about your future married life and willing to accommodate your partners likes and dislikes, even to the extent of improving your physical appearance.
But you need to understand marriage has much more to do with how you treat your partner, their families and friends, how you discharge various roles associated to your marital relationship, etc.
Be mindful of marrying someone who values your thoughts, emotions, goals, personality, etc. and not just your looks, that do not last for more than 15-20 years in a 40-50 years long marriage (ideal case).
Now, coming to your query. Yes, there are various cosmetic and surgical treatments like 'Augmentation Mammoplasty' available in the quasi-medical industry.
But I would not suggest you to go through the process as it may impact your health otherwise and may impact your self image even more negatively.
Next Steps
Consult a Psychologist.
Interpersonal Guidance and Counselling is required.
Health Tips
Mr. Gunjan Maithil
Senior Psychologist
Cell: nine six seven one three zero three one three four
Website: https://gunjanmaithil.wixsite.com/therapy
App: http://wix.to/fECHB08?ref=cl