A-g GPA:2.8
Act: 18 (plan to atleast get a 20)
Csulb
Csuf
Sfsu
Sac state
Sonoma
Fullerton and Long Beach are pretty unlikely. The others will depend on your major.
I’d be sure to include a non-impacted campus - Monterrey or East Bay are worth a look.
Best chances at SFSU/Sac State/ Sonoma and will depend upon major. I agree that CSUF/CSULB are Reach schools and are impacted campus wide. Look at the non-impacted campuses: Channel Islands, Dominguez Hills, Bakersfield, Stanislaus and East Bay.
The major I’m planning to do is computer science
I believe Ima be applying at
1.Csuf (instead of csulb)
2. Sac state (instead of sfsu)
3. Sonoma state
4. Chico
5. Cpp (since it’s said to be that they accept everyone from my school except if it’s an engineering major)
Out of these school which do you believe I will more than likely get into. 
I would say Sonoma State would be your safest school followed by Sac state and Chico State. CPP is impacted for CS so minimum EI and being local will not get you in and CS is also impacted at CSUF so both schools would be a Reach. As stated above, add another non-impacted campus to your list. Here is the list of impacted majors:
http://www.paly.net/sites/default/files/csu%20impactedprogramsmatrix%2015.pdf
CS is one of the more competitive programs at most CA colleges. There’s no harm in applying to all the schools on your list. IMHO you have a decent shot at Sac but since they are a fairly recently impacted campus, it is hard to say exactly where they will draw the line this year. I think Sonoma could go either way. The other campuses probably won’t accept you.
I’d again encourage you to add a non-impacted campus or 2 just to be sure. SF and East Bay would be good candidates.