Position Help

Hey y'all I need some help. My boyfriend and I have been together for about two and a half years now. We'll just say he's less than well endowed, if you know what I mean. We have only tried Missionary and laying on our sides with my leg over his and that doesn't work out at all.

I'm a plus size girl and I have seriously low self esteem so I don't like to ride him (not to mention I am horrible at it because I don't do it enough due to my self esteem issues). I'm getting bored with just Missionary, but I don't know what other positions to try since he's only got like a 4-5" erect penis. Any opinions would be appreciated.