Scared to grow up

I'm 18. Recently I've been deeping my life a lot and it makes me feel like ****.

I have a good set of friends who I spend a lot of time with. I usually chill with them everyday. I have a job. I have a loving family. So really I don't have any reason to be depressed all the time but I am.

I just can't stop thinking about my future. The fact that I will only have a few more years left with my friends and I will probably lose contact with them. The thought of growing older and being bored with life. Hell, if I'm stuck at home even for one day I get bored to death. All I want to do is go out with my mates every night.

I just keep thinking my life is going to get ****. All my mates will be living their lives in their 20s and I'll still be stuck here with my parents (who are on benefits as it is) with a *****y job and no friends.

I'm probably just overthinking everything but I've been so close to bursting out into tears a couple of times which is strange because I NEVER cry.

One thing I will say is that I do smoke a lot of weed. I've been smoking it on and off for about 2 years now but recently I've been smoking it every day, and these thoughts have only recently come into my head when I've started smoking more.

Any advice would be appreciated.