How can I see my son?

My son is 1 years old and lives with his mother and her mother 5 minutes away from me. After my ex and I split early in 2017 she decided she doesn’t want me around my son stating that it’s unfair to put him in a situation like we have now. The only way she will let me see my son is if she is present and I have to go to her mothers house to visit with him and that’s OCASSIONAL. She fights with me about coming to see him and tells me that I haven’t been apart of his life but gives me no chance to do so. Our situation is slightly different because we are young parents and don’t agree on how we should share our child. My money is very limited I’m 20 years old working full time to support myself but will do anything for the chance to be with my son. She filed for child support but dropped the case stating “she doesn’t want to have a custody agreement, she would rather me be out of my sons life completely” unfortunately for her that is not going to work for me.