Now it freaks me out

I just had a conversation with my older sister and her friend (I'm 19 and they're 26) about protections for sex.

I asked my doctor for the pill, realized it was not suitable for my body so stopped taking it but now I have a bf and I want to have sex with him.

My sister and her friend just told me how violent effects the pill gave to their bodies (every kind of pills), how chemical it was etc.

So there are just condoms left and it freaks me out, because there is still tiny chance to get pregnant by using just condoms...but I really want to have sex with my bf as much as I want.

I know i have to relax but being pregnant that young scared me so much.

To what extend do you rely on condoms??