Eye Shape Surgery To Make My Eyes More Masculine?

Unless we can actually see what your concerns are, we can't really give you accurate advice. I agree with Dr. Steinsapir, that some of what you are describing does raise some red flags in regards to the psychological aspect of your desires/expectations.

There are surgical techniques available that will address some of your concerns. No exercises are effective.

If you are truly interested in this, a consultation with an ASOPRS trained Oculoplastics surgeon would be helpful. You can find one close to you on ASOPRS dot org.

You are 21.  The human brain does not finish developing until age 27-perhaps longer for some of us.  In considering this concern, I noticed that you did not post any photographs.  I question the ethics of recommending a particular surgery without a good faith examination.  An ethical surgeon will explore with you if you have body dysmorphic disorder, if your concerns and expectations are realistic, and if there are any other factors that might effect your ability to achieve a desired result.  If you do decide to have consultation regarding these issues, do your homework on the potential surgeon.  Determine if they have the appropriate scope of training, appropriate hospital privileges for the surgery you are considering.  Check with your state to determine if there any disciplinary issues regarding the potential surgeon.  Of course, you could also consider posting your question with photographs.

When choosing an eye plastic surgeon for male blepharoplasty, it is important this specialist knows how to differentiate the techniques used in male blepharoplasty from those meant for female blepharoplasty. It is important that men retain their masculine image rather than the more stereotypical feminine result.

A man’s eyes may be characterized as feminine if they appear round or doll-like. Typically, a man’s upper eyelid crease is lower than a woman’s and the eyebrow is more level (as you probably achieve a more masculine look by squinting and lowering your brow.) These features should be preserved during blepharoplasty for men in order to retain the masculine appearance of the face. Another important factor is not to over-correct a man’s eyelid during male blepharoplasty. As men age, their eyelids will differ from those of their youth, and blepharoplasty for men should appreciate this subtle difference.

Based only on your description, I would doubt that there is any good surgical option for you.  It is possible that lowering your eyebrows may help.  Botox or Dysport in the forehead can achieve this affect in many people temporarily. 

Surgery for making eyes less round would be  unusual and as with many things that are only rarely done, execution of the procedure and predictability of the outcome will be less than ideal.

The facial skeleton, especially the eye sockets, have much to do with the shape and position of the eyes.

If squinting your eyes and flexing your facial muscles makes your round eyes look more eliptical and masculine then you should consider orbital rim implants.

Orbital rim implants are made in different shapes and thicknesses.  They are placed through an incision in your mouth so there are no visible scars.  The implant will elevate your cheek and lower lid so you don't have to. 

Good luck in your pursuit and let me know if I can be of further assistance.