I am on holiday in Lithuania (Kaunas) but don't really speak Lithuanian, are there shops with self service tills so I don't have to ask the staff to speak English?

I am a very socially anxious person, so of course I decided to travel to a foreign country where I don't speak the language because I'm a genius. I went to a shop earlier to buy some basic stuff and when I went to check out I didn't say a word. The staff member asked me a question after I already handed her the money and I panicked and just looked at her confused. She seemed like I annoyed her.

I get that she probably thought I was rude not replying because how was she supposed to know I don't speak the language, but it was very awkward for both of us and I'd like to avoid that in the future. I also feel like an asshole if I ask if they speak English because I'm going to a different country and expecting them to speak my language (99% of people won't be offended, I know, it's my anxiety talking).

If I could find a shop with self checkout that I can bumble my way through by guessing and using Google translate that would be ideal for me. Are there any shops like that?