Strictly speaking, do you need sponsors/ Godparent for baptism? Because I didn’t have sponsors when I was baptized. I’m just curious.
To the best of my knowledge, adults (and I am including teenagers) usually have at least one sponsor - but not having a sponsor does not affect the validity of one's baptism. Having a sponsor is a way to have someone with you on your Christian walk, as a mentor and friend. There are certainly other ways for a new Christian to be discipled, and if you want this, I would suggest that you talk to your clergy about it.
One course about which I have heard very good things is "Christianity Explored". It can be a help to new believers and I do know churches in the UK offer it. You might see if your church offers it, or a nearby church, perhaps: https://www.christianityexplored.org/Groups/276341/Home/CE_ORG/Find_a_Course/Find_a_Course.aspx I would recommend this course for anyone.