What problems might you face?
- If you're under 18, most rabbis absolutely will not work with you. Some might with active (and written) permission from your parents.
- Rabbis might not take you seriously because of your age. Of course, that applies across the board to any decision you make. At this age, most people won't take you seriously about any major life decision. I don't think anyone took me seriously until at least 24. Rabbis may be particularly hesitant if you have a bad home life. They may think you are trying to escape an abusive or otherwise negative family setting. But don't fret yet. Many conversion candidates (myself included) come from difficult family situations. Perhaps that is what makes us comfortable with making major life changes!
- Rabbis may not believe you will maintain major life changes. For example, I know many people who became vegetarians for a few months or changed college majors 5 times. If you're in high school, you may choose to go to college in a community with few Jewish resources. When you're just starting your adult life, rabbis may doubt your willingness to live far from your family, even a bad one.
- You have limited financial resources for books, tutoring, or establishing a kosher home.
- You may lack the financial resources and job training to move to a large urban area.
- Most batei din will expect you to move out of your parents' home and may even require full financial independence from your family. (And in some cases, they'll just tell you they expect full financial independence, even though they might accept significantly less.) Moving out of your parents' home is generally a non-negotiable prerequisite.
- Rabbis may be more hesitant than normal about a conversion candidate dating a Jew because secular dating rarely leads to marriage at those ages. No matter how insistent you are on staying with your partner, a beit din may not take your relationship seriously. Thus, they believe that your interest in Judaism will stop once the relationship ends.
And now that you're frustrated, let me remind you of what you will hopefully avoid if you pursue your conversion now:
- The "shidduch crisis." You should be available to date and marry at the "normal" ages instead of starting "late."
- You are less likely to fall victim to unscrupulous people who charge exorbitant fees for tutoring and conversion. You simply can't afford them. You may also qualify for free or reduced conversion fees. But do be careful of people who may exploit your naivete.
- You will build Jewish memories very early in your adult life. I can attest to the comfort I have from knowing that basically my entire adult life has been lived Jewishly. Born Jews often seem to feel they can relate to me better once that piece of information is exposed. I guess I seem less alien.
- You may still qualify for "life experiences" that frum-from-birth young adults experience. This includes the ability to attend yeshiva/seminary in Israel, working as a camp counselor during the summers, joining the Israeli Defense Force, attending a college with a large frum population, or marrying young and having your first child by 20. Not to mention Birthright.
Conversion as a young adult is difficult but certainly not impossible. Many people who begin considering conversion at that age take several years to "seal the deal." I would be one of those people, starting my own process at 20 but not having any conversion until 25. I feel that was the right decision in my case, but everyone is different. This is not something you want to rush.
Please feel free to add your own advice to the comments.