I have a natural widows peak. Can I have a hair transplant to have a more natural, straight hairline? I am a 19 year old male.

If you are considering surgery, it is best to have a consultation with a doctor in person.  Blindly wanting surgery without a proper examination without understanding the risks involved is not the way to go about it.

I encourage most men to wait until their are 30 years old before undergoing hair restoration. At 19 you do not know the future of your hair line so any surgery you do now could be a huge mistake.  It's easier and safer to simply shave the widow's peak if you want your hairline to look straighter.  Restoration of the hairline is an art. Every hairline design is unique in order to create the right curves and arches to fit each individual patient's facial shape and size.

You're much too young for any HT surgery. Take the time to understand your hairloss, the fact that it progressess over a lifetime. It's called Male Pattern Baldness (MPB).Even before you ever consider a HT, you must understand your hairloss and where it can be headed according to your own family history. If there are advanced classes of MPB on either side maternal or paternal, then it is very likely that you will be headed for the same. You need to "first" understand both the benefits and risks of HT surgery.You need to reserach what the effective hairloss meds are and how they work. No doubt at your age, you are more a candidate for a medicinal approach to your hairloss than surgery.After you have an understanding of your own hairloss, then see a reputable doctor who would first need to make a formal diagnosis of MPB and also to get you started on Propecia, etc.The worst thing you can do is to be driven by your emotions looking in a mirror at your hairline every five minutes, and thinking you will solve everything by just jumping into a HT.Take your time and wait to see  your hair loss progress in the next 5 years 
Best wishes 

The beauty about a hair transplant is that you can design the hairline however shape you desire. If you do not like your widow's peak, grafts can be placed in such a way as to camouflage it. Alternatively, if you want to create a widow's peak or soften your frontotemporal recessions, this can be done nicely with hair grafts. It is important, however, to understand that the majority of patients with male pattern hair loss will continue to thin as they age and that surgical intervention will do nothing to stop the hair loss process.  It is nearly impossible to predict the final pattern in someone your age.  Although it is possible to begin surgical restoration if you have conservative goals, a hair transplant will provide only a short term density boost since the preexisting hair will continue to thin over time.  It is important for you to have a perspective of what your final pattern will be since your surgical options will be based on that final pattern and on the limitations of your donor area.  Medical therapy such as Propecia/Finasteride and Rogaine/Minoxidil does have the potential to slow the hair thinning process.  

At 19, you should never consider a hair transplant because your pattern of hair loss is not apparent and you will be chasing hair transplants for years. Run from any doctor who offers you a hair transplant