The OU offers free courses online on their free learning platform if you wanted to take a look.
Basically the OU offers distance learning for degree courses, taken part-time this lasts for 6 years but you can space it out over 16. Most of the content is now delivered completely online, you'll have a tutor group and a forum you can chat on and there maybe some group work involved. It is designed for those that have no formal qualifications, have families and work. I completed mine as a single parent to an autistic child whilst working full-time - I'm not saying that was a good move it almost killed me at times but it's definitely possible around a child
Module 1 level 1 is roughly GCSE level.
Module 2 Level 1 is roughly A level.
Module 1 level 2 is roughly year 1 at a standard university.
Module 2 Level 2 is roughly year 2 at a standard uni.
Level 3 is the same as a normal year 3 uni and you complete a dissertation or similar piece of work to get your Hons
You still get tuition fee loans which you'll have to pay back but they are less than if you attended a full-time course and obviously you don't have any additional accomodation fees. There maybe some grants or loans available for childcare.
You need to deal with your own feelings here though. It sounds like you have made some poor choices in the past, having a criminal record. Made decisions that your parents aren't necessarily proud of or which have taken you down a road they had not dreamed of for you when you were a little girl and they will be worried about you. Presumably your choice to have a child also impacts on them in supporting you and although I'm sure they love you both this may have changed how the saw their years in their 50s playing out.
You need to put your big girl pants on and accept the fact that yes, you are a young mum, yes you may have made choices in the past but now you are putting that behind you and going to be the best mum you can be. Yes, other people may look at you when out and about but let them look and think what a wonderful job you are doing.
Remember at this stage they have no idea whether you are mum, sister, au pair or a nanny and nor is it any of their business
Have a Google today and find all the mum and baby groups in your area. Start with the library and their Bounce and Rhyme sessions, these sessions are just as much about mum's connecting as anything else. Ask your HV for information on any Young Mums groups in the area (a person is a categorized as a Young Mum up to 25) and get some peers support.