1. You can always study for the LSAT, as anything.
2. You need a recognized undergraduate degree.
3. Certain skills (writing, general knowledge) need to be aquired before law school. If you aren’t good at learning stuff, don’t become a lawyer.
4. If you are good at gemara, you’ll probably be good at learning other systems of law. If you hate gemara, you’ll probably hate studying other systems of law. If your Rosh Yeshiva is begging you to join the most advanced shiur, and is offering you a job as a teacher – that a good sign you’ll make it in law school. If the Rosh Yeshiva is suggesting you need a real job, law may be a poor choice for you.
5. Are you sure you want to be a lawyer. If you think it is a “ticket” to riches you are mistaken. It requires a serious investment, with a very uncertain return. If the job appeals to you, go for it.
6. That you think to ask “Am I smart enough to go to law school” suggests you are seriously out of touch with reality. That should be corrected before looking for a job.