No lawyer can answer your question without knowing many more details regarding your case including what alleged evidence the government intends to introduce against you, how they obtained the evidence, and a variety of other factors. In a general sense, the federal government does not indict defendants unless they have a solid case. If "three people signed on you," and that is the only evidence against you (that is no phone records, recorded conversations etc.) then you should discuss the possibility of prevailing at trial with your lawyer. If its only a "Snitch" case, then other lawyers might feel more comfortable going to trial.
You need to sit down with your lawyer and go over the case with him. He will need to explain to you the basis for the charges, how the Federal Sentencing Guidelines work and what you are being asked to do. I am assuming you have hired an experienced criminal defense lawyer and there is simply a communication problem. If you are still not satisfied after that meeting with your lawyer, feel free to contact me.
What you need to do is speak with your lawyer and sit down and review all of the evidence against you in order to see the strength of the government's case. If 3 people are cooperating against you, one of the many things to look at would be whether their information corroborates one another and also whether their information is corroborated by other evidence (i.e. wiretaps, video surveillance, etc.) The answers to these questions can help in evaluating the likelihood of prevailing at trial. Deciding whether you should plead is a difficult decision that can only be made once you are fully informed about what you are facing.
(Please note that this answer does not constitute legal advice nor does it establish an attorney-client relationship.)