Pregnancy anxiety

Hi, so I've been on birth control pills for almost a year ang I've been with my boyfriend for 2 years. The first year we used condoms but it seems that ever since I got on birth control  ok I've become so anxious about the possibililiry of becoming pregnant. I take the pill like I'm supposed to everyday but it's just a fear I can't shake. I feel being on birth control is the responsible thing to do since I do not want a child at the moment but the effects of these pills are just so hard to deal with sometimes. . Any advice or piece of mind? Thanks.