Secrets

I'm 16 and i lost my virginity in April this year - I was on the pill and still with him now, I fell pregnant in July and decided to have an abortion as I wanted to complete my education and I knew I couldn't provide for a child, I'm finding it very hard to cope with the decision I made - I haven't told a single adult not even my mum and only my closest friend and boyfriend know about it, I feel really lonely about the whole thing and feel a lot of guilt ,any advice?