Am I a candidate for a tummy tuck? 22 years old, no kids.

Weight loss and exercise can only go so far, but reaching your weight goal objective prior to surgery would decrease the risks for complications during and after surgery and enhance the TT results.  The most common indications for a TT are loose abdominal skin, especially in the lower abdomen and loose abdominal wall muscles.  Stretched out skin that has lost its elasticity can only be improved with removal of this excess skin.  
Liposuction will allow you to have stubborn fat resistant to exercise and diet removed from unwanted areas (hips, stomach, thighs, back) and transferred to areas that can benefit from the added volume and will result in a waist as small as possible. Liposuction results are highly surgeon dependent as the skill of liposuction rests in removing as much fat as possible while leaving the skin smooth.

Really cannot offer meaningful advice without seeing your body and better understanding your situation and goals.  It sounds like a lower stable weight is what you really want first, and that is easier to achieve than ever before:  you CAN do it.  Then, if you get to your 130-150 and stay there for a while (education is the best medication), decide if you still want all of those changes.