Scared of overstretching myself

I’m (18F) and a virgin. I have a bf but we haven’t gotten to that step. To get myself off I’ve been using dildos that are pretty average sized (5-6inches). But lately they have been feeling kinda small. I love feeling full and I want to buy one of those bigger dragon dildos with the ridges. But I’m scared of overstretching myself to the point I can’t go back to normal size stuff. I don’t want to ruin my future sex life with my bf or future partners. Will I be ok? Idk what to do 🥲

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