It's not them you want to avoid, they are nice supportive people from what you say, it's your own sense of inferiority you're discomforted by.
They must see qualities in you they like and appreciate that make them want to be friends with you.
If they are genuine, supportive and kind, it would be a pity to lose that because you are feeling the social pressure that comes with measuring up status of material possessions/beauty/indications of 'success' etc. and finding yourself wanting.
I get it, I'm the poor one in my friendship group. No one has ever made me feel inferior. My own minds eye often has, it is very uncomfortable to feel like a lesser person.
I am the least well groomed person in my group too 🙈. However, I felt it was my internal emotional weather that was the issue rather than the group.
I did have to steel myself inside to keep showing up - remind myself of the reasons I was there (from their pov and mine), I'm bright, funny and kind - that's what they valued in me.
I've been in this group from mid twenties and we're all mid forties now... As time has gone on, it has got easier...
The challenges of life have been a bit of a leveller and we've all come through our own issues and all have felt the grass is greener at some point (or could easily do so if we looked at it that way).
Wealth
Health
Marriages
Children
Family
Work
We've all had a variety of ups and downs... But through it all we've had each others back.
I'm still the poor one but I'm blessed in other ways and I have things in my life they would envy if we looked at things that way.
If this comes with you, I'd say remind yourself of your worth and keep going, see past their beauty and money to the people they are deep down... If they're good people/friends it will all come out ok.