how can i help this?

Try replacing your 4 letter vocabulary with some of these Not only are they more fun to say, but it will definitely catch more people's attention My favorite one is "InfectiousToad Spotted Horn-Beast"
http://www.pangloss.com/seidel/shake_rule.html

On one of the teen sitcoms I know, they have pulled the S-word and the F-word together to 'Shuck'. Maybe you could try using that.

Swearing is typically a sign of an inadequate vocabulary. If you find yourself resorting to swear words constantly then you need to expand your vocabulary. There is a whole world full of wonderful words out there and if you are only resorting to use small words like the "f-word" or the "s-word", then you are pin-holing yourself.

My best suggestion is for you to not replace those swear words with new swear words, but to cut out swearing altogether. You need to find a better way to express how you feel and the only way you're going to do that is if you start training yourself to use a more grown up vocabulary and holding yourself accountable when you do swear. Maybe a swear jar, where the money goes to someone else, like a charity, your school or your mom. Then get yourself a good dictionary and start teaching yourself a new word every day. Make a point of using that word at least once during that day both in speaking and writing and at the end of the week, give yourself a vocabulary test, make it fun like trying to use all of the words you learned correctly in one conversation.

Also, I suggest you need to start to explore those feelings of hurt and anger that cause you to lose control and resort to swearing. Maybe keep a journal to write down your real feelings without any swear words. I think that will help you to outgrow swearing a lot because you'll start to be able to talk about why you're feeling the way you are and not just sputter swear words.

Good luck

I have a college vocabulary but my brain doesn't know that when i'm mad

I personally don't have a problem with swearing and think there's something quite therapeutic about having a rant every so often. You just need to be careful who you do it to and that you do it in an assertive way and not an aggressive way. I work in mental health and work largely with young people and have no issue at all with swearing providing its in private (i.e. not a group setting) and not directed at me. If the swearing is becoming a problem (you can't control it) then maybe you need to look at why you're feeling angry and what can be done to remedy the situation. Also looking at ways of relaxing when you are feeling stressed or worked up.

Sometimes you just need to grow out of it.
I just kinda realized how immature I sounded when I swore, so I stopped. I swore a lot until I was about 17 or so, then it slowed... by the time I was 20, it pretty well stopped except for an occasional f-bomb when I dropped beads or a box of pins and needles. Now, I might say about one actual "curse" word per month, if that.

Me and my friends put 50 cent in a pot for every unhealthy thing we eat to prevent us from fattening. If the pot is full we're probably going to buy ourselves nice fruits and veggies. You can do something like that.

There is a time and a place to swear. I'm around children a lot so I've learned to replace the words with things that sound similar but wont offend, like sugar instead of shit or fudge instead of fuck....

they all seem to be sweets related.

I don't swear very much unless I'm really annoyed, like Monika said.. you kinda grow out of it when you realize how silly they are to over use.