Advice Needed ?

I need some advice. I've been with my boyfriend for almost four years. The love we share for each other is indescribable. I'm 20 (soon to be 21) and he's 21. Im young but at the point in my life and maturity- that I'm ready for the next step. We've talked about marriage and starting our lives together. Both him and I have agreed to wait until we're completely financially stable to start a family. I completely support that decision. We both have jobs, and support each other. We've come to a mutual agreement that if I did get pregnant earlier than expected, we would support each other and start our family. I'm just in search of some advise. Every time I find out one someone close to me becomes pregnant or is engaged- I have this sad feeling overcome me. Any suggestions on what to do? Please be sensitive and understanding to my request.