Tanning

I lay out all of the time. I have very fair skin . Ive only burnt a few times this summer. I’m going to the beach in a few weeks and I’m wondering what spf I need. I don’t want to burn at the beach but I normally just use a spf 8 tanning oil If anything. Is it true the more you lay out the less likely you are to burn? What spf should I be using in order to tan but not burn? This is my current bikini bottom tan line.