Slow down, Shirley! You have a lot going on here, so let's take things one at a time. First, you should not have been enrolled in a debt management plan if your income level does not allow for the monthly payment. Call the debt management agency as soon as possible, and ask to speak with a supervisor. Have them go over your case from start to finish. If a mistake as big as putting you in an unaffordable plan was made, other issues may have been overlooked as well. Find out if your payment can be lowered to what you can afford. Many agencies can offer a hardship debt management plan titled a "call to action," which lowers the interest rate on your credit card accounts to the lowest possible level. That may decrease your monthly payment enough to make the debt management plan work for you.
A reputable credit counseling agency will not enroll persons in a debt management plan unless the counselor has provided a spending plan that balances income and expenses. If you are having trouble meeting your monthly payment because you are not following the spending plan provided by the agency, then you have a decision to make. Either get back on track and spend only as the plan allows, or increase your income with a part-time job or other income source.
Second, as for bankruptcy advice, I'm not surprised the counselor didn't give you any. Only an attorney can give legal advice, and bankruptcy is a legal process. However, your counselor can and should go over the pros and cons of filing for bankruptcy and whether it would make sense for you to get a legal opinion for your particular situation.
Third, should you find you absolutely cannot afford to make your payment and want to explore bankruptcy, I recommend you contact an attorney who specializes in consumer bankruptcy. To qualify for a Chapter 7 filing (in which your debts are forgiven and not repaid) your income must be below the median income for your state.
You would typically include all your debt in a bankruptcy filing, but you can file a reaffirmation document for a particular debt(s) if you have a good reason for doing so. You and your attorney will have to sign the reaffirmation document that states you can afford to repay the debt and it will not be an undue hardship on your post-bankruptcy budget to continue to pay the debt you would like reaffirmed. Typically, unsecured debts would not be included in a reaffirmation, which would include personal loans. Most reaffirmations would be for car or mortgage loans. I'm not sure why you would want to reaffirm a personal loan, but if you can convince the court and your attorney that it would be in your best interest to do so, you could file a reaffirmation for the debt.
Lastly, you wanted to know if you should have filed instead of going on a debt management plan. My answer is that if the debt management plan can be made to work, you are usually better off. A bankruptcy can stay on your credit report for up to 10 years. A poor credit report may affect your ability to get a decent apartment, home or insurance for years to come. If you have no other way out, then you may have no choice but to file. Just be sure you consider all the potential ramifications before you decide.