Internships and references

Do all internships (Engineering) require references?

I have a part-time job but the managers in store don't like me, and I don't even know the name of my line manager (all communication through text). I've done a few volunteering things but feel weird/uncomfortable about asking them for references... Would this be OK even if my volunteering was from years ago, or should I just seek more volunteering opportunities?

Honestly, I think anxiety is part of my issue which I'm seeking help for, but just wondering what to do if all else fails.

Thanks

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