The salary distribution is merely a result of how much big law pays compared to everything else. If you make big law, you earn 160k. If you make big law in a secondary market you might make 125-160k. Very few new attorneys end up in mid-law. Most of your remaining options are smaller firms or government jobs. Government jobs start you off in the 50k range (60k in some places). Smaller firms also start you off around the same range. Of those two options, government jobs are usually better. However, in small firms your pay can sometimes scale well (depends).
With a 2.2 after your first semester, you will not get big law. You won't have the required grades to make it to the top 10% or so of your class (what you will probably need for big law at a school in your range). You will most likely end up below median, so making the top 10% or so is not really possible. 3Ls have a "small" opportunity to get into big law, but 3L OCI for big law is almost non-existent. Further, you are unlikely to have the grades (and the luck) required to pull that off.
If you have strong family connections, staying in law school might make sense. Otherwise, the risk is, in my opinion, too great. If you were attending law school with very little cost, the risk might be worth it. There are jobs available for people who perform poorly from a decent school. The problem is these are not good jobs and will likely hire you part-time or by the hour. Do you really want to attend law school and end up earning half as much or less than some people with Bachelor's degrees (e.g. engineering).
Law school costs too much money and too many people choose to attend. The legal field has more fresh graduates each year than the good positions available to them. Ask yourself whether it is worth taking massive loans and earning 40k/year in a small firm that works you to death. 40-60k/year in a government job is one thing (nicer hours, some upward mobility/etc), but 40k/year in a dead end job is a whole different scenario. Unless you have solid reasons for remaining in law school you should consider dropping out (reasons like guaranteed job, almost no loans, etc).