I am 17 years old, and I have a problem with my frenulum breaking during sex. I do want to have a circumcision, but I do not know how to go about it, especially how to mention it to my parents, find a doctor, etc. Also, what level of pain will I receive during the operation? Need it be done under local anesthetic, or is general anesthetic available?

What to do?
There are a lot of reasons to get circumcised. I can see you are comfortable talking about one of them. Your frenulum will only break so many times and then it will be torn or flattened out or whatever happens to it. But it will stop breaking and work like it is supposed to. I am sure you can have it clipped too if you want.
I would recommend that you think of the other reasons you want to have it done and ask around. You may find that not as many others are concerned with their partners foreskin or lack of it. You will also get all kinds of information on which is better.
There are up sides to both. There are more people defending staying uncircumcised online lately. I am comfortable with it either way. I had it done at 21 and I cant say I have major regrets and I was really happy about it for about 15 years. However, I cant say I would do it again.
When it comes to sex, orgasms feel good. It is just a different path to get to them. I can give more details if you want to know but for now just believe me your parts will work either way and they will feel good when they are supposed to.
Talking to your parents. It is tough to do. From an adult perspective, your parents have talked to everyone they know about this topic. All of their friends probably know what they decided and they have probably talked more about it than parents of circumcised kids. Not having you circumcised was a hot topic back when you were born and they probably took some heat for not having it done. It is the elephant in the room. You just need to bring it up and they will probably tell you all about it. Instead of "why didnt you have it done" "Did doctors try to talk you into having me circumcised when I was born". Let them tell you the pros and cons. Once you get them talking I think you will be able to guide the conversation. They were looking out for your best interest when they made the decision, and they probably still are.
Make sure you are ready to tell them all the reasons you want it done and be ready to listen. The doctor you are looking for is called a urologist. They will have some opinions on it too. It hurts enough to wake you up at night for about four days. The daytime is pretty much ok. After six weeks or so things will start to normalize and after a year you will start to forget that it was an issue to you. Things can go wrong but dont let people scare you. It is your choice.
Let me know if I can tell you anything else.
Do not sacrifice your sexual life!
DO NOT DO THIS!
I've undergone circumcision as adult and I ruined my sexual life. In sex I feel now hardly a quarter of what I had being intact.
I used to read a guy's cry where he wrote: "I'm ready to give all my property, everything I have to somebody who could restore my foreskin." +1.
If you have very short frenulum ask a doc but from my own experience (sacrifice is more correct word) I know that it was normal but it's too short now.
Also keep in mind that frenulum is very sensitive zone so don't loose it.
At your age you could have just incorrect sex experience, don't hesitate to talk to your doctor.
Don't believe bullshit from pro-circ websites, there is noting but lie in there. I know myself, I am one of their victims.
Surgery pain (very little in fact) is just nothing compare with what you will feel (not feel to say more correctly) after the surgery. You are so young, my son is double of your age... really be patient, wait, read as much as possible, meet real people circumcised as adults.
I don't know about infant's circ but it's not an option for an adult: you will loose 75% of sex pleasure. It will not make your sex longer, it will not let your
penis grow (you'll find it smaller 'because it goes inside after the surgery, if you are afraid of it). The only advantage I noticed is absence of smegma and smell of it, but we are not living in a desert and bathrooms are available for everybody. Also keep in mind that light smell of smegma attracts women: all those "magic" perfumes have additives of smegma origin.
Shortly: if you enjoy food try to cut your tong and ...good luck to enjoy.
I'm not any kind of "activist", I'm here to share my real life experience. Again: DO NOT DO THIS!
be patient.
circumcision is a very permanent procedure, and to me it seems like a drastic approach to anything.