It is true that there is more things in your life than just your sexual orientation. Being gay (or straight) is just a part of yourself. You are much more than just your sexual orientation. We all have different opinions about different things, different personalities, different experiences, different interest, different hobbies, different jobs, different families, different diseases, different places we live etc. Sexual orientation does not dictate these things and is often not even involved at all with many of these things.
And when you vote for a candidate, it is almost guaranteed that you are not able to find a candidate that agrees with you on every issue. With the current political system you have to make compromise and try to choose a candidate that has a chance to be elected and is closest to your opinions.
As a Finn I am not able to vote for Trump, but I would vote for him if I could and if the other choices were the current ones. And I am a gay, but not self loathing in any way. I just wish that we here would have similar politicians that understand that uncontrolled Muslim immigration at this rate cannot continue or it is going to destroy Europe. As a gay I am very afraid for the future of next generations of gays if we let Islam to take over of Europe. And even though it won't happen immediately, it will happen in a frighteningly short time period, if this mass immigration from Muslim countries is not stopped.
And before somebody starts to lecture that not all Muslims want to kill gays, I recommend they to check the human rights situation of gays in Muslim countries and the opinion polls done among Muslims both in Muslim countries and in western countries as well. Practically all Muslim countries are more or less black holes for human rights and not just for gays. My best friend, with whom I have lived several years, happens to be a gay from Muslim background and trough him I have much more detailed than many naive leftist who seem to think that we have resources to save the whole world and just being nice to other we will be rewarded with nice behavior towards us. They don't understand that both Islam and overbreeding are the main reasons why these countries they are coming from, are such poor and terrible places. And if we let these people and they continue to insist to practice backwards religion, cousing marriages with mental retardiation and to overbreed, we have not saved their own countries, but we are going to cause the same kind of problems to appear here as well and destroy our own country as well.
And it is not just the gay rights or the rights of women that are at risk. Even with the current immigration levels there is starting to be more and more often Islamic terror attacks in Europe (of course, in many Muslim countries there is even much more terrorism). Sharia patrols are starting to attack people if they drink alcohol, have dog, seem to be gay etc. In many areas firemen, ambulances etc are attacked and they don't go there at least without police escort and even police tries to avoid these areas that seem to be spreading.
And it is not just human rights and security that are threatened. For example, there will be even much more difficult housing crisis, we will run out of money to have social security anymore. On average humanitarian migrant will cost about 500000-1000000 euros during their lifetime and employment levels are often extremely low (partly because of socil security, partly because they tend to have extremely low education or are often even illiterate, even though local job markets tend to require education, speaking local languages etc). Last year there were much more than million asylum seekers.
Of course Trump is not perfect. He uses ruder language than I would in many things. But he seems to be one of the few who understands that uncontrolled immigration is going to destroy Europe if it is let to continue for much longer. And that issue is much more important than having gay marriage accepted or not. What good does gay marriage do, if within couple generations there will be sharia law which totally prohibits homosexuality or if there are routinely violent attacks towards gays.