Hooded eyelids, 19 years old. Is there a way I can correct them? (Photo)

However, a conservative upper blepharoplasty would give you an improvement you are looking for. A blepharoplasty incision scar heals beautifully and is fully hidden in a crease. Sometimes, even in young patients, the anatomy dictates what procedure is necessary. The upper blepharoplasty should be done in a very subtle way, by an experienced surgeon that has performed the surgery on young patients before.  See attached picture of a 20 year...sometimes a blepharoplasty is just the right thing to do. You have to make sure that you preserve your eyelid volume, however. Especially since you are very young. 

Hooded eyes can be corrected by blepharoplasty, Botox injections, laser skin tightening treatments, and cosmetic eyelid surgery.This is a common question. Upper eyelid hooding can be corrected with blepharoplasty or cosmetic eyelid surgery. It is one of the first cosmetic surgeries people usually get. Usually the incision line will be placed at the eyelid crease to keep it hidden, promote healing, and create a natural look.
Surgery is not for everyone. In today's day and age, there are many nonsurgical options to consider and laser is usually the most dramatic result. Botox injections as well as laser treatments can also be a tremendous benefit if you are not interested in surgery. Of course, there are also many combinations. In your case, placing Botox into the temporal brow can raise the lateral brow creating a less eye hooded look. 
There are many options when it comes to reducing upper eyelid hooding. The choice really depends on your unique anatomy as well as what exactly is bothering you. I would recommend that you see a board-certified plastic surgeon in your area that is a member of both ASPS & ASAPS and performs a lot of eyelid lifts but also offers all the nonsurgical options such as injectables and laser treatments. Go over your concerns with them and make sure above all, you walk out of there with several options and an idea of the pros and cons to each of them as well as realistic expectations. 
I hope this helps answer your question. If it does, please take a moment to up vote this answer on the “respond” button on the top right.  

You have many good questions and there is so much information to give but I will keep it rather brief because ultimately you need a consultation.
Here goes:
"Hooded eyes" is a loaded term. There are people who have a "hooded" appearance because of aging, others because of their anatomy, others because of other reasons, etc. The first step is to find out what is causing the "hooded" appearanceYou mention endoscopic brow lift, having tight skin, etc. so I'm assuming you feel you have a "hooded" appearance because your brows are low?An endoscopic brow lift is not just about the forehead skin; where the brow fat pad lies is keyYour appearance may not necessarily be due to brow ptosisYou reference PDO threads as an "option" if you're referencing it as a brow lift option, I would vote no in general because there are other issues/limitations/etc associated with that. You mention you don't want blepharoplasty because you don't want a scar your whole liftwithout saying whether you need / don't need blepharoplasty, I will just say that the blepharoplasty incision is typically hidden in the eyelid crease and heals very well in general; so it therefore does not pose an issue for patients
Again, a consultation with an experienced Oculoplastic surgeon is important and hopefully you can get some tailored answers and recommendations. 

You have a very full heavy brow which most people consider attractive.  If you have some Botox placed into the temporal brow,  you should get an elevation of the lateral brow which will make it appear less hooded.