Worries about death and OCD

When I was younger, I had what I called worries. I had frequent worries about my family's death, growing up, my death, etc. and sometimes it prevented me from sleeping well. I was very afraid of growing up. I also had OCD, where I always had to make sure the lights were off, the doors were closed, I'd get up sometimes after going to bed to make sure they were off and closed. All this passed, but I still slept with something like a baby blanket, which I know is weird, especially now since I'm 14. I can't tell people because I know they won't accept me for it. I can go a night or two without it, like on sleepovers and such, however I can't for longer periods of time and it interferes with my sleep pattern as well as causing me to "worry". Lately, I've been having trouble sleeping and my "worries" have come back. I worry about deaths again, growing up, and a little about sleeping with my blanket. What can I do? Please answer ASAP. Thanks.