If so, it depends on your location. You didn't say where you live so I will assume you are in the United States.
Eleven states (California, Connecticut, Maryland, Massachusetts, Nevada, New York, New Jersey, Indiana, Illinois, Pennsylvania and Vermont) and Washington, D.C. either implicitly or explicitly state that sexual orientation cannot legally prevent gay and lesbians from adopting, according to the Urban Institute report.
Three states have laws denying gays and lesbians the right to adopt or take in foster children.
Though Mississippi allows single gays and lesbians to adopt, it prohibits same-sex couples from adopting. Utah excludes same-sex couples indirectly through a statute barring all unmarried couples from adopting or taking in foster children.
Florida is currently the only state that specifically bans "homosexual" individuals from adopting, although the state does allow them to be foster parents.
In the remaining 36 states, gays and lesbians who want to adopt or take in foster care children are at the mercy of judges and adoption and foster agencies, according to the Evan B. Donaldson Adoption Institute, a non-profit organization that studies adoption and foster care.
These all apply to public/ foster adoptions. Private and international adoptions are easier to obtain.

i live in pakistan. its illegal here. now i have started hating gays and bi's. i want to be normal like others. Can't i have my own children as a normal male in future?

I haven't ever been involved in any sexual activity. its a sin. Now i have started hating bi's. i want to be a normal person. its a sin.

I don't think that you can change wanting men just because you would like to but there is nothing stopping you from marrying a woman and having children. And, while you certainly have a right to your opinion, I don't think you should hate anyone just because you disapprove of their sexual orientation.
Good luck with whatever you wind up doing.

Thanks to deteragram. Will my children be homosexuals? will it have any affect on my wife?

Some people have argued that the tendency toward homosexuality runs in families but I do not think that has been proven; if you are bisexual or homosexual that does not mean that your children will be bisexual or homosexual.
As for your wife, some women will not be accepting of a man who was bisexual. You could keep it a secret but I think honesty is the best policy. Any woman who agrees to be your wife deserves to know the whole truth about her spouse.

You mean that inspite of being a bisexual, I can have a complete family; A wife and children of my own and I have nothing wrong with my gender as i am not a gay coz they can't have babies of their own...right?

Yes, you can have a wife and children.